11. Tyler corporation is a wholesaler that sells a single product. Management has provided the following cost data for two levels of monthly sales volume. the company sells the product for $127.27 per unit. sales volume (units): 5000 6000 cost of sales: $419,500 $502,800 selling and administrative cost: $186,000 $202,200 the best estimate of the total contribution margin when 5,300 units are sold is