HW4.39

 public class Solution
 {
     public static void main(String[] args)
     {
         double sum;
         double baseSalary = 5000;
         int i = 0;
         double prize = 0;

         while(true)
         {
             if(i <= 5000)
                 prize = i * 0.08;
             else if(i <= 10000)
                 prize = i * 0.1;
             else
                 prize = i * 0.12;
             i++;
             sum = prize + baseSalary;

             if(sum >= 30000)
                 break;
         }

         System.out.println("The sale amount is " + i);
     }
 }