Billing for service A common method of billing for service calls is to charge a flat fee p...

Billing for service A common method of billing for service calls is to charge a flat fee plus an additional fee for each quarter-hour spent on the call. Create a function for a washer repair company that charges $40 plus $20 for each quarter-hour or portion thereof—for example, a 30-minute repair call would cost $80, while a 31-minute repair call would cost $100. The input to your function is any positive integer. (Hint: See Exercise.)

(e)