Relevant Range and High-Low Method The following selected data relate to the major cost categories experienced by Sterling Company at varying levels of operating volumes. Assuming that all operating volumes are within the relevant range, calculate the appropriate costs in each column in which blanks appear: Total Cost (@ 5,000 Units) Total Cost(Variable Cost Total Fixed Total Cost (@ 6,000 units) per Unit Cost 7,000 units) Direct labor (variable) $60,000 $72,000 $ Factory supervision (semi-variable) 20,000 22,000 $ Factory depreciation (fixed) 18,000 18,000 $ Check