(TCOs 2,4, 5, and 8) Write a program to input a purchase amount and calculate the sales tax and total due. The sales tax depends on the county identifying code. Counties with a number less than 20 have a 5% sales tax. The 21–35 codes have a sales tax of 6%. Codes above 35 have a sales tax of 7%. The purchase amount and county code are entered by the user. Use a loop to validate that the county code is between 10 and 40. Display the amount of the sales tax and the total. (Points : 20)