A department of Alpha Co. incurred the following costs for the month of September. Variable costs, and the variable portion of mixed costs, are a function of the number of units of activity:
 Activity level in units 5,500
Variable costs$11,000
Fixed costs 32,000
Mixed costs 19,900
Total costs$62,900
During October the activity level was 7,800 units, and the total costs incurred were $69,500.
a. Calculate the variable costs, fixed costs, and mixed costs incurred during October.
b. Use the high-low method to calculate the cost formula for mixed cost. (Do not round intermediate calculations and round your answers to 2 decimal places.)
Cost formula                   +                      per unit


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