Chloe lives in an area where she runs the air conditioner during the 4 hottest months of the year. The air conditioner runs for 7 hours per day at a cost of 21 cents per hour. How much does she spend per year on utility bills for the air conditioner?(Assume there are 30 days in each month) a. $705.60 b. $588.00 c. $216.09 d. $176.40