src/Q2/BonusOnSavings.java


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package Q2;

public class BonusOnSavings {
  double annualRate = 0.0;
  double quarterlyRate = 0.0;

  public BonusOnSavings() {
    this(0.03, 0.05);
  }

  public BonusOnSavings(double quarterlyRate, double annualRate) {
    this.quarterlyRate = quarterlyRate;
    this.annualRate = annualRate;
  }

  public double computeBonus(double monthlyCommitment, double q1, double q2, double q3, double q4) {
    double quarterlyTarget = monthlyCommitment * 3;
    double annualTarget = monthlyCommitment * 12;

    return this.quarterlyBonus(quarterlyTarget, q1)
        + this.quarterlyBonus(quarterlyTarget, q2)
        + this.quarterlyBonus(quarterlyTarget, q3)
        + this.quarterlyBonus(quarterlyTarget, q4)
        + this.annualBonus(annualTarget, q1 + q2 + q3 + q4);
  }

  private double quarterlyBonus(double target, double actual) {
    return (actual >= target) ? actual * this.quarterlyRate : 0.0;
  }

  private double annualBonus(double target, double actual) {
    if (actual < target) return 0.0;

    return (actual * this.annualRate) + ((actual - target) * 0.25);
  }
}