Can someone post a full solution to this question? How should I go about approaching this? I have no idea where to start.

Chapter 4 Maling Decisions 25. A mobile phone service provider three different subscription packages for its Mobile Service Provider has Package Ae For s39.99 per month 450 minutes are provided. Additional minutes are per minute. Additional minutes are Package B: For $59.99 per month 900 minutes are provided. $0.40 per minute. Package C. For s6999 per month unlimited minutes provided package write a program that calculates a customer's monthly bill. It should ask which display has purchased and how many minutes were used. It should then the total amount due. Inpar Validation: Be sure the reser only selects package A. B, or C 26, Mobile Service Provider, Part 2 also displays how much Modify the Program in Programming Challenge 25 so that it how money Package A customers would save if they purchased packages B or C, and there much money Package B customers would save if they purchased Package C. If would be no savings, no message should be printed. 27. Mobile Service Provider, Part 3 days have hours. Months with 30 days have 720 hours, and months with 31 744 in February, with 28 days, has 672 hours. You can calculate the number of minutes a month by multiplying its number of hours by 60. Enhance the input validation of the Mobile Service Provider program by asking the user for the month (by name), and validating that the number of minutes entered is not more than the maximum for the entire month. Here is a table of the months, their days, and number of hours in each. 744 anuary 720 744 744 744 Loops and Files TOPICS The Increment and Decrement 5.2 Introduction to Loops: The while Loop 5.3 Using the while Loop for input 5.5 The do-while Loop 5.6 The for Loop 1 The Increment and Decre S.1 CONCEPT and are operators that To increment a value means to increase it decrease it by one. Both of the following stard And nun is decremented in both of the followi C++ provides a set of simple unary operators th ing variables. The increment operator is... and statement uses the operator to increment num