Marwick's Planos, Incorporated, purchases planos from a large manufacturer for an average cost of $1,513 per unit and then sells them to retail customers for an average price of $2,600 each. The company's selling and administrative costs for a typical month are presented below: 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 Cost Formula: $936 per month $ 4,813 per month, plus 4% of sales $ 61 per piano sold" $ 666 per month. $ 5,040 per month $ 13,443 per month $ 693 per month $ 2,478 per month, plus $36 per piano sold $915 per month During August, Marwick's Planos, Incorporated, sold and delivered 60 planos. 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.