The Students Club is offering a new travelling package or membership. People can choose either one of three packages : a) business, b) family or c)single package. Each packages have different prices...

The  Students Club is offering a new travelling package or membership. People can choose either one of three packages : a) business, b) family or c)single package. Each packages have different prices for monthly subscription. A business package is RM40, a family package is 20 and single package is 30. People can choose any package and duration-in-month for subscription. The program will calculate and display the total of payment. The program can be repeated as long as the option to exit is not selected. Any invalid input will result in an error message to retry.

Create a program that have at least three user defined functions. Three of the functions are having the return type void and calculating the total of each packages. The display is done in separate function.