Problem 12-19 (Algo) High-low method LO 12-6 A department of Delta Company incurred the following costs for the month of June. Variable costs, and the variable portion of mixed costs, are a function of the number of units of activity: Activity level in units Variable costs Fixed costs 5,000 $ 9,000 29,000 24,540 $ 62,540 Mixed costs Total costs During July, the activity level was 8,200 units, and the total costs incurred were $69,500. Required: a. Calculate the variable costs, fixed costs, and mixed costs incurred during July.