Marwick's Pianos, Inc., purchases pianos from a large manufacturer for an average cost of $1,502 per unit and then sells them to retail customers for an average price of $2,400 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 $939 per month $4,772 per month, plus 5% of sales $61 per piano sold $658 per month $4,988 per month $13,455 per month $718 per month $2,538 per month, plus $38 per piano sold $894 per month During August, Marwick's Pianos, Inc., sold and delivered 61 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