Vaughan, Inc. reports the following information for August: $ 800,000 110,000 Sales Revenue Variable Cost of Goods Sold Fixed Cost of Goods Sold Variable Selling and Administrative Costs Fixed Selling and Administrative Costs 45,000 100,000 70,000 Calculate the contribution margin for August using variable costing. O $690,000 O $475,000 $590,000 O none of these choices O $645,000