+ A Company Comparative Income Statement for the Years Ended December 31, 2010 2011 Net Sales Revenues 70000 80000 Cost of Goods Sold ?????? ?????? Gross Profit ?????? ?????? Operating Expenses: Administrative Exp. 6000 20000 Selling Exp. ?????? ?????? General Exp. 3000 2500 Total Expenses ?????? ?????? Net Profit or Loss ?????? ?????? The above table shows comparative income statement of a company for the financial periods ended on December 31, of the years 2010 & 2011 Required: Use equations or functions to calculate cost of goods sold (40% of net sales revenues), gross profit, selling expenses (10% of net sales revenues), total expenses, and net profit or loss. Use equations or functions to calculate rate of return on sale, change rate of sales revenue and gross margin on sales