Williams 18e, 119) Mitchum, Inc. produced different amounts of product X each month as follows: Units Costs 70 20 50 50 50 21,300 22,050 21,000 24,000 22,500 ril une ul ugust Using the high-low method, determine: (1) The variable expense per unit (2) The fixed expense (3) If Mitchum produced 410 units what would total expenses be