High-Low and Cost Formula Harrison Company has accumulated the following total manufacturing overhead costs for two levels of activity (within the relevant range): Low High 80,000 120,000 $468,000 $604,000 Activity (direct labor hours) Total manufacturing overhead The total overhead cost includes variable, fixed, and mixed costs. At 120,000 direct labor hours, the total cost breakdown is as follows: Variable cost $264,000 60,000 Semi-mixed cost $180,000 Fixed cost a. Using the high-low method of cost analysis, determine the variable portion of the semi-variable cost per direct labor hour. Determine the total fixed cost component of the mixed cost Isolate mixed costs: Low High Total cost Less: Variable cost Fixed cost Total mixed cost High-Low Analysis: Round variable portion per unit to two decimal places, if applicable High-Low Analysis: Round variable portion per unit to two decimal places, if applicable. Direct Labor Hours Total Mixed Cost Variable Portion Fixed Portion High Low Difference Variable portion per unit:s b. What should the total planned overhead cost be at 100,000 direct labor hours? Variable Cost Per Unit Fixed Costs Variable cost Fixed cost Mixed: Variable portion Fixed portion Totals Total planned overhead for 100,000 direct labor hours $