【解決方法】私には何が欠けているのでしょうか？ これを解決するために私は非常に多くの方法を試しました。

The cost to ship a package is a flat fee of 75 cents plus 25 cents per pound.
1. Declare a constant named CENTS_PER_POUND and initialize with 25.
2. Get the shipping weight from user input storing the weight into shipWeightPounds.
3. Using FLAT_FEE_CENTS and CENTS_PER_POUND constants, assign shipCostCents with the cost of shipping a package weighing shipWeightPounds.

私が試したこと：

import java.util.Scanner;

public class ShippingCalculator {
   public static void main(String[] args) {
      Scanner scnr = new Scanner(System.in);
      int shipWeightPounds;
      int shipCostCents = 0;
      final int FLAT_FEE_CENTS = 75;
      final double CENTS_PER_POUND = 25;
      
      shipWeightPounds = scnr.nextDouble();
      shipCostCents = FLAT_FEE_CENTS + (CENTS_PER_POUND * shipWeightPounds);

      System.out.println("Weight(lb): " + shipWeightPounds);
      System.out.println("Flat fee(cents): " + FLAT_FEE_CENTS);
      System.out.println("Cents per pound: " + CENTS_PER_POUND);
      System.out.println("Shipping cost(cents): " + shipCostCents);
   }
}