A corporation sells a single product. Management has provided the following cost data for two levels of monthly sales volume. The company sells the product for $160.00 per unit. Sales volume (units) 8,000 12,000 Cost of sales $ 720,000 $ 1,080,000 Selling and administrative costs $ 320,000 $ 420,000 The best estimate of the total contribution margin when 12,500 units are sold is: O $562,500 $1.125,000 O $625,000 O $875,000