Marwick's Pianos, Inc., purchases pianos from a large manufacturer for an average cost of $1,494 per unit and then sells them to retail customers for an average price of $3,100 each. The company's selling and administrative costs for a typical month are presented below: Cost Formula Costs Selling: $947 per month $4,817 per month, plus 6% of sales $58 per piano sold $654 per month $5,041 per month Advertising Sales salaries and commissions Delivery of pianos to customers Utilities Depreciation of sales facilities Administrative: Executive salaries Insurance Clerical Depreciation of office equipment $13,477 per month $711 per month $2,483 per month, plus $41 per piano sold $937 per month During August, Marwick's Pianos, Inc., sold and delivered 57 pianos. Required: 1. Prepare a traditional format income statement for August. 2. Prepare a contribution format income statement for August. Show costs and revenues on both a total and a per unit basis down through contribution margin