PayCalculator.java

package payroll;

public class PayCalculator {
  public static float calculate(double hours,
                                double rate,
                                boolean isHourlyWorker) {
    if (hours < 0 || hours > 80) {
      throw new RuntimeException("Hours out of range: " + hours);
    }
    float wages = 0;

    if (hours > 40) {
      float overTimeHours = hours - 40;
      if (isHourlyWorker) {
        wages += (overTimeHours * 1.5) * rate;
      } else {
        wages += overTimeHours * rate;
      }
      hours -= overTimeHours;
    }
    wages += hours * rate;
    return wages;
  }
}