payroll swing applet version 2

I need to have a payroll Swing applet that allows the user to enter two double values: hours worked and hourly rate. When the user clicks a JButton, gross pay is calculated.

In addition I need to have the federal withholding tax substracted from gross pay based on:

Income$                 Withholding%
0 to 99.99                      10
100 to 299.99      15
300 to 599.99      21
600 and up      28

I am stuck trying to have the program to substract in %.
Any help would be appreciated. Here is my code:

// Stephanie De Bernardi
// POS 406

// Modify the payroll Swing applet so that federal withholding tax is substracted from gross pay based on:
// 0 to 99.99 = 10%
// 100 to 299.99 = 15%
// 300 to 599.99 = 21%
// 600 and up = 28%


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JCalculatePay2 extends JApplet implements ActionListener
{
    JLabel companyName = new
    JLabel("Accounting Inc");
    JButton calcButton = new JButton("Calculate");
    JButton okButton = new JButton("OK");
    JLabel perPersonResult = new JLabel("Payroll.");
    JLabel totalResult = new JLabel("Calculate hours worked and hourly rate");
    int totalPay;

    Font bigFont = new Font("Helvetica", Font.ITALIC, 24);

    public void init()
    {
         Container con = getContentPane();
         con.setLayout(new FlowLayout());
         companyName.setFont(bigFont);
         con.add(companyName);
         con.add(calcButton);
         con.add(okButton);
         calcButton.addActionListener(this);
         okButton.addActionListener(this);
         con.add(perPersonResult);
         con.add(totalResult);
    }

    public void start()
    {
         perPersonResult.setText("Your pay is.");
         totalResult.setText("Calculate hours worked and hourly rate");
         repaint();
    }

public void actionPerformed(ActionEvent e)
{
    Object source = e.getSource();
    if(source == calcButton)
    {

          String response = JOptionPane.showInputDialog(null, "Enter the number of hours worked");
          int[] hoursLimit = {0, 100, 300, 600};
          int[] withholding = {10%, 15%, 21%, 28%};
          int hourlyRate = Integer.parseInt(response);

          response = JOptionPane.showInputDialog(null, "Enter the hourly rate");
          int hoursWorked = Integer.parseInt(response);


    totalPay = (hoursWorked * hourlyRate) - "%;
    totalResult.setText("$" + totalPay);
}
}

Thanks