Marwick's Pianos, Incorporated, purchases pianos from a large manufacturer for an average cost of $1,514 per unit and then sells them to retail customers for an average price of $3,400 each. The company's selling and administrative costs for a typical month are presented below: Cost Formula Costs Selling: Advertising Sales salaries and commissions Delivery of pianos to customers Utilities Depreciation of sales facilities Administrative: Executive salaries Insurance clerical Depreciation of office equipment $ 964 per month $ 4,813 per month, plus 3% of sales $ 60 per piano sold $ 663 per month $ 5,070 per month $ 13,600 per month $ 688 per month $ 2,470 per month, plus $38 per piano sold $ 896 per month During August, Marwick's Pianos, Incorporated, sold and delivered 63 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