//Mobile Service Provider //A mobile service provider has 3 different data plans for its customers: // A - $39.99 per month, 4 GB included.$10 each additional GB //B - $59.99 per month, 8 GB included. $5 each additional GB //C - 69.99 per month, unlimited data //Write a program that calculates a customers monthly bill. It should ask which package the customer has purchased and how many GB used. //It should then display the total amount due.

Input Validation: Switch must be used. Be sure the user only selects package A, B, or C. Cannot use any code from beyond Chapter 4