An Internet service provider has three different subscription packages for its customers:

Package A: For $15 per month with 50 hours of access provided. Additional hours are $2.00 per hour over 50 hours. Assume usage is recorded in one-hour increments.

Package B: For $20 per month with 100 hours of access provided. Additional hours are $1.50 per hour over 100 hours.

Package C: For $25 per month with 150 hours access is provided. Additional hours are $1.00 per hour over 150 hours Write a program that calculates a customers monthly charges.

Input Validation: 1) Be sure the user only selects package A, B, or C; or a, b, or c. 2) The user cannot use more than 720 hrs in a month. (We will assume a 30-day month for this probkem).

Demonstrate test cases described in table: Test Case Package Hours 1 A 50 2 a 51 3 B 100 4 b 101 5 C 149 6 c 251 7 e 720 8 c 722

Clearly identify the results of each test case.