Manny is a plumber and charges $50 when he visits a client and $30 per hour for every hour he works. His bill can be expressed as a function of hours, x, with the function f(x) - 50 +30x which statement explains the meaning of the Inverse of the function?
А
Cost per hour as a function of the total bill
B
Total bill as a function of the number of hours
С
Number of hours as a function of the total bill
D
Total bill as a function of the cost per hour