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TransitCalculator.java

public class TransitCalculator {
  int numberOfDays;
  int numberOfRides;
  
  String[] rideName = {"Pay-per-ride", "7-day Unlimited", "30-day Unlimited"};
  double[] ridePrice = {2.75, 33.00, 127.00};

  TransitCalculator(int numberOfDaysIn, int numberOfRidesIn) {
    numberOfDays = numberOfDaysIn;
    numberOfRides = numberOfRidesIn;
  }

  double unlimited7Price() {
    double weeks = Math.ceil(numberOfDays / 7.0);

    double totalCost = ridePrice[1] * weeks;
    return totalCost / numberOfRides;
  }

  double[] getRidePrices() {
    double weeks = Math.ceil(numberOfDays / 7.0);
    double thirtyDays = Math.ceil(numberOfDays / 30.0);

    double payPerRideCost = ridePrice[0] * numberOfRides;
    double unlimited30Cost = thirtyDays * ridePrice[2] / numberOfRides;
    double[] prices = {Math.round(payPerRideCost * 100) / 100.0, Math.round(unlimited7Price() * 100) / 100.0, Math.round(unlimited30Cost * 100) / 100.0};
    return prices;
  }

  String getBestFare() {
    double[] prices = getRidePrices();

    double smallestPrice = prices[0];
    int smallestIndex = 0;
    for (int i = 1; i < 3; i++) {
      if (prices[i] < smallestPrice) {
        smallestPrice = prices[i];
        smallestIndex = i;
        continue;
      }
    }
    
    System.out.println(smallestIndex);

    return "You should get the " + rideName[smallestIndex] + " option at $" + smallestPrice + " per ride.";
  }

  public static void main(String[] args) {
    TransitCalculator tC = new TransitCalculator(100, 30);
    System.out.println(tC.getBestFare());
  }
}