Your utility company charges 15 cents per kilowatt-hour of electricity. complete parts (a) and (b) below. a. what is the daily cost of keeping lit a 150-watt light bulb for 8 hours each day? b. how much will you save in a year if you replace the bulb with an led bulb that provides the same amount of light using only 10 watts of power? a. the daily cost of keeping lit a 150-watt light bulb for 8 hours each day is $.