HW7.12

 import java.util.Scanner;

 public class Solution
 {
     public static void main(String[] args)
     {
         double[] rates = {0.10, 0.15, 0.25, 0.28, 0.33, 0.35};
         int[][] brackets =
         {
             {8350, 33950, 82250, 171550, 372950},
             {16700, 67900, 137050, 208850, 372950},
             {8350, 33950, 68525, 104425, 186475},
             {11950, 45500, 117450, 190200, 372950}
         };

         Scanner input = new Scanner(System.in);
         System.out.print("Input the number of the people(0 to 3): ");
         int person = input.nextInt();
         System.out.print("Input the income: ");
         int income = input.nextInt();

         input.close();

         double tax = computeTax(brackets, rates, person, income);
         System.out.println("The tax is " + tax);
     }

     public static double computeTax(int[][] brackets, double[] rates, int person, int income)
     {
         int largerCount = 0;
         for(int i = 0; i < brackets[person].length; i++)
         {
             if(brackets[person][i] < income)
                 largerCount++;
             else
                 break;
         }

         if(largerCount == 0)
             return 0;
         else if(largerCount == 1)
             return (income - brackets[person][0]) * rates[0];
         else
         {
             int tax = 0;
             tax += (income - brackets[person][largerCount - 1]) * rates[largerCount];
             largerCount--;
             while(largerCount > 0)
             {
                 tax += (brackets[person][largerCount] - brackets[person][largerCount - 1]) * rates[largerCount];
                 largerCount--;
             }
             tax += brackets[person][0] * rates[0];
             return tax;
         }
     }
 }