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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: During July, the activity level was 16,000 units, and the total costs incurred were $141,000. Required: a. Calculate the variable costs, fixed costs, and mixed costs incurred during July. b. Use the high-low method to calculate the cost formula for mixed cost. Complete this question by entering your answers in the tabs below. Use the high-low method to calculate the cost formula for mixed cost. Note: Do not round intermediate calculations. Round your answers to 2 decimal places