Frazier Manufacturing Company collected the following production data for the past month: Units Produced Total Cos 1,600 1,300 1,500 1,100 $66,000 57,000 67,500 49,500 If the high-low method is used, what is the monthly total cost equation? a. Total cost $13,200+$33/unit b. Total cost $16,500+$30/unit c. Total cost-$O+$45/unit d. Total cost $9,900+$36/unit