Reference Solution for FRQ of 2025 Asia Set(Updated)

Question 1

• Part a

   public void updateInventory(int numParts) {

		int baseCount = 0;
		int wheelCount = 0;

		for (int i = 1; i <= numParts; i++) {
			String type = generator.nextPartType();
			if (type.equals("base")) {
				baseCount++;
			} else {
				wheelCount++;
			}
		}

		basesAvail += baseCount;
		wheelsAvail += wheelCount;
    }

• Part b

   public String checkInventory(int numToys, String toyInfo) {

		int atLoc = toyInfo.indexOf("*");
		int dollarLoc = toyInfo.indexOf("$");

		String modelName = toyInfo.substring(atLoc + 1, dollarLoc);
		String wheelNum = toyInfo.substring(dollarLoc);

		int wheelsPerToy = 2;

		if (wheelNum.equals("four")) {
			wheelsPerToy = 4;
		}

		if (numToys <= basesAvail && numToys * wheelsPerToy <= wheelsAvail) {
			return modelName + "-enough parts";
		} else {
			return modelName + "-need parts";
		}

    }

Question 2

public class RentalCarPlan {

	private double dailyRentalFee;
	private int numberOfFreeMiles;
	private double perMileCharge;

	public RentalCarPlan(double fee, int mile, double milefee) {
		dailyRentalFee = fee;
		numberOfFreeMiles = mile;
		perMileCharge = milefee;
	}

	public double calculateBill(int days, int miles) {

		double totalRental = days * dailyRentalFee;

		double mileageCharge = 0;

		if (miles > numberOfFreeMiles) {
			mileageCharge = (miles - numberOfFreeMiles) * perMileCharge;
		}

		return totalRental + mileageCharge;
	}

	public boolean costsLessThan(RentalCarPlan otherPlan, int days, int miles) {
		double cost1 = calculateBill(days, miles);
		double cost2 = otherPlan.calculateBill(days, miles);
		return cost1 < cost2;
	}
}