JComboBox help

I need help getting the calculated square feet to multiply by the set price in the comboBox so it can be displayed in the result (line 157), I removed it because it was not working, should have posted it first sorry
I've been learning for a few weeks and would appreciate your help

import java.text.DecimalFormat;
import javax.swing.JOptionPane;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author Owner
 */
public class CalculatorForm extends javax.swing.JFrame {

/**
     * Creates new form CalculatorForm
     */
    public CalculatorForm() {
        initComponents();
    }

/**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

jLabel1 = new javax.swing.JLabel();
        widthTextField = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        heightTextField = new javax.swing.JTextField();
        calculateButton = new javax.swing.JButton();
        answerLabel = new javax.swing.JLabel();
        clearButton = new javax.swing.JButton();
        priceComboBox1 = new javax.swing.JComboBox();
        jLabel3 = new javax.swing.JLabel();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("square inches to feet");

jLabel1.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel1.setText("Width. inches");

jLabel2.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
        jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel2.setText("Height, inches");

calculateButton.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
        calculateButton.setForeground(new java.awt.Color(255, 0, 0));
        calculateButton.setText("calculate sqft");
        calculateButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                calculateButtonActionPerformed(evt);
            }
        });

answerLabel.setBackground(new java.awt.Color(0, 255, 255));
        answerLabel.setFont(new java.awt.Font("Tahoma", 0, 24)); // NOI18N
        answerLabel.setForeground(new java.awt.Color(255, 0, 0));
        answerLabel.setText("=");

clearButton.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
        clearButton.setForeground(new java.awt.Color(0, 51, 255));
        clearButton.setText("clear Fields");
        clearButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                clearButtonActionPerformed(evt);
            }
        });

priceComboBox1.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        priceComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "$9.99", "$10.99", "$11.99" }));

jLabel3.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        jLabel3.setForeground(new java.awt.Color(0, 102, 51));
        jLabel3.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel3.setText("Set square feet price");

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(answerLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 501, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(0, 0, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 80, Short.MAX_VALUE)
                            .addComponent(widthTextField))
                        .addGap(18, 18, 18)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, 80, Short.MAX_VALUE)
                            .addComponent(heightTextField))
                        .addGap(18, 18, 18)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(calculateButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(clearButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 178, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGroup(layout.createSequentialGroup()
                                .addGap(46, 46, 46)
                                .addComponent(priceComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 79, javax.swing.GroupLayout.PREFERRED_SIZE)))))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(jLabel1)
                    .addComponent(clearButton)
                    .addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(widthTextField)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(heightTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(calculateButton)
                        .addComponent(priceComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 22, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGap(18, 18, 18)
                .addComponent(answerLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 38, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(23, 23, 23))
        );

pack();
    }// </editor-fold>
     
    
    private void calculateButtonActionPerformed(java.awt.event.ActionEvent evt) {

String sqftPrice = this.priceComboBox1.getSelectedItem().toString();
                 
        double number1 = 0, number2 = 0;

try {
            number1 = Double.parseDouble(this.widthTextField.getText());
        } catch (Exception e) {
            JOptionPane.showMessageDialog(this, "Invalid entry", "ERROR", JOptionPane.ERROR_MESSAGE);
        }
        try {
            number2 = Double.parseDouble(this.heightTextField.getText());
        } catch (Exception e) {
            JOptionPane.showMessageDialog(this, "Invalid entry", "ERROR", JOptionPane.ERROR_MESSAGE);
        }
        
        double answer = number1 * number2 / 144;
        DecimalFormat decFormat = new DecimalFormat("#0.00");
        this.answerLabel.setText("= " + decFormat.format(answer) + "  square feet @ " 
                +  (sqftPrice) + " =" +" total!!");
                 
        
    }

private void clearButtonActionPerformed(java.awt.event.ActionEvent evt) {                                            
        widthTextField.setText("");
        heightTextField.setText("");
        answerLabel.setText("");
    }

/**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(CalculatorForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(CalculatorForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(CalculatorForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(CalculatorForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

/* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new CalculatorForm().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JLabel answerLabel;
    private javax.swing.JButton calculateButton;
    private javax.swing.JButton clearButton;
    private javax.swing.JTextField heightTextField;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JComboBox priceComboBox1;
    private javax.swing.JTextField widthTextField;
    // End of variables declaration
}

Stop using automated GUI tools. They produce code which nobody can read. And the long lines mess up the formatting and are really difficult to read.
Get your sq foot calculator working as astandalone app. Show a printout of sq feet, like thisOnly when you are sure that is working should you even consider a GUI.