C++ program using if else if statement

A bank charges $10 per month plus the following check fees for a commercial checking account: $.10 each for fewer than 20 checks $.08 for 20-39 checks $.06 each for 40-59 checks $.04 each for 60 or more checks The bank also charges an extra $15 if the balance of the account falls below $400 (before any check fees are applied). Write a program that asks for the customer name, beginning balance, and the number of checks written. Compute and display (with two decimal points where appropriate) the name, beginning balance, the bank's service fees (show the service fees separately check fees, below $400.00 fee), the number of checks written and the ending balance. Input Validation: Do not accept a negative value for the number of checks written. In that case, print an appropriate message and terminate the program. Also, if a negative value is given for the beginning balance, display an appropriate message, and terminate the program