Question 1 of 3 View Policies Current Attempt in Progress Mighty Bright Window Cleaners' monthly income statement at several levels of activity is as follows Windows washed 1.000 2.000 3,000 Sales revenue 3.000.000 000 Cost of goods sold 1.200 2,400 3,600 Gross profit 100 3.600 5,400 Operating expenses Advertising expense 400 400 400 Salaries and wages expense 700 900 1.100 Insurance expense 200 200 200 Postage expense 400 800 1,200 Total operating expense 1,700 2,300 2.900 Operating income $ 100 $1,300 2.500 (a) identify each expense as fored, variable, or mixed Cost of goods sold Advertising expense Salaries and Wages expense Insurance expense Postage expense Prepare a contribution margin income statement based on a volume of 2.500 windows. (Round unit cost to 2 decimal places, eg 52.75 and all other answers to 0 decimal places, a 5,275) 2.500 windows Per Unit eTextbook and Media Attempts: 0 of 3 used