Ivanhoe Manufacturing Company collected the following production data for the past month: Units Total Produced Cost 1600 $55500 1340 50300 1550 62000 1 100 44000 If the high-low method is used, what is the monthly total cost equation? Total cost = $0 + $40/unit Total cost = $4400 + $36/unit Total cost = $22000 + $20/unit Total cost = $18700 + $23/unit