EX 21-7 High-low method OBJ. 1 Diamond Inc. has decided to use the high-low method to estimate the total cost and the fixed and variable cost components of the total cost. The data for various levels of production are as follows: Units Produced Total Costs 12,000 $424,000 15,000 496,000 21,000 640,000 ter 21 COSC Delaviui un a. Determine the variable cost per unit and the total fixed cost. b. Based on part (a), estimate the total cost for 17,000 units of productie