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: 3,500 Activity level in units Variable costs Fixed costs Mixed costs Total costs $ 6,125 32,000 19,050 $57,175 During October, the activity level was 9,400 units, and the total costs incurred were $69,500. Required: a. Calculate the variable costs, fixed costs, and mixed costs incurred during October. Variable cost October $ 16,450 $ 32,000 $ 21,050 Fixed cost Mixed cost 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 $ 0.34 per unit