In the Sheridan, maintenance costs are a mixed cost. At the low level of activity (100 direct labor hours), maintenance costs are $1200. At the high level of activity (300 direc labor hours), maintenance costs are $1650. Using the high-low method, what is the variable maintenance cost per unit and the total fixed maintenance cost? Variable Cost Per Unit Total Fixed Cost $2.25 $975 $5.50 $275 $2.25 $450 $5.50 $1950