Bank Charges

A bank charges $10 per month plus the following check fees for a commercial checking account:

$.10 each for fewer than 20 checks

$.08 each for 2039 checks

$.06 each for 4059 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 beginning balance and the number of checks written. Compute and display the banks service fees for the month.

Input Validation: Do not accept a negative value for the number of checks written. If a negative value is given for the beginning balance, display an urgent message indicating the account is overdrawn. I need help for that