Winston, which uses the high-low method, had an average cost per unit of $10 at its lowest level of activity when sales equaled 10,000 units and an average cost per unit of $6.50 at its highest level of activity when sales equaled 20,000 units. What would Winston estimate its total cost to be if sales equaled 8,000 units? A. $24,000 B. $52,000 C. $70,000 D. $94,000