Pharoah Manufacturing Company collected the following production data for the past month: Units Produced Total Cost 5200 $83000 3000 56500 3200 76000 2800 50000 If the high-low method is used, what is the monthly total cost equation? (Round units to nearest whole number, e.g 9.) Total cost = $11500 + $13.75/unit Total cost = $0 + $45/unit Total cost = $19200 + $11/unit Total cost = $16500 + $30/unit