Please include all formulas.

Waterway Window Cleaners' monthly income statement at several levels of activity is as follows: 2,000 4,200 8,600 $ 3,500 $ 7,350 $ 15,050 1,400 2,940 6,020 2,100 4,410 9,030 Windows washed Sales revenue Cost of goods sold Gross profit Operating expenses Advertising expense Salaries and wages expense Insurance expense Postage expense Total operating expense Operating income 400 700 400 920 200 882 200 400 1,360 200 1,806 3,766 5,264 420 1,720 2,402 380 $ 2,008 $ $ (b) Prepare a contribution margin income statement based on a volume of 6,900 windows. (Round unit cost to 2 decimal places, eg. 52.75 and all other answers to 0 decimal places, e.g. 5,275.) 6,900 windows Per Unit $ >