A mobile phone service provider has three different subscription packages for its customers:

Package A: For $39.99 per month 450 minutes are provided. Additional minutes are $0.45 per minute.

Package B: For $59.99 per month 900 minutes are provided. Additional minutes are $0.40 per minute.

Package C: For $69.99 per month unlimited minutes provided.

Write a program that calculates a customer’s monthly bill. It should display a menu asking which package the customer has purchased. It should do input validation to detect that the user supplied A, B, or C. Next the program should ask how many minutes were used. It should then display the total amount due.