An electric utility company determines the monthly bill by charging 80.1 cents per kilowatt-hour (kWh) used plus a base charge of $17.25 per month. Thus, the monthly charge is given by the function f(W) = 0.801W + 17.25 dollars, where W is the number of kilowatt-hours. a. Find f (5000) and explain what it means. b. What is the monthly charge if 8500 kWh are used?