HW4.7

 public class Solution
 {
     public static void main(String[] args)
     {
         double rate = 0.05;
         double balance = 10000;
         double sum = 0;

         for(int i = 0; i < 10; i++)
             balance = balance * (1 + rate);

         System.out.println("The cost after 10 years is " + balance);

         for(int i = 0; i < 4; i++)
         {
             balance = balance * (1 + rate);
             sum += balance;
         }

         System.out.println("The total cost of 4 years: " + sum);
     }
 }