An electric utility company determines the monthly bill by charging 78.6 cents per kilowatt-hour (kWh) used plus a base charge of $20.85 per month. Thus, the monthly charge is given by the function f(W) = 0.786W+20.85 dollars, where W is the number of kilowatt-hours. a. Find f (2000) and explain what it means. b. What is the monthly charge if 3500 kWh are used? a. Select the correct choice below and fill in the answer box to complete your choice. (Simplify your answers. Type integers or decimals.) OA. f(2000)= The charge for kWh is $2000. OB. f(2000)= The charge for 2000kWh is $

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