Crane Window Cleaners' monthly income statement at several levels of activity is as follows: Windows washed 2,500 4,200 7,800 $ 3,800 $ 6,384 $ 11,856 Sales revenue Cost of goods sold 1,400 2,352 4,368 Gross profit 2,400 4,032 7,488 Operating expenses Advertising expense Salaries and wages expense 400 400 400 750 920 1,280 Insurance expense 200 200 200 Postage expense 450 756 1,404 Total operating expense 1,800 2,276 3,284 Operating income 600 $1,756 $ 4,204 Sales Revenue Variable Expenses 3 Cost of Goods Sold Salaries Expense Postage Expense Total Variable Expenses Contribution Margin Fixed Expenses Advertising Expense Salaries Expense Insurance Expense Total Fixed Expenses Operating Income 14141 $ 5214 66 1.79 Current Attempt In Progress Crane Window Cleaners' monthly income statement at several levels of activity is as follows: Windows washed 2,500 4,200 7,800 Sales revenue $ 3,800 $6,384 $ 11,856 Cost of goods sold 1,400 2352 4,368 Gross profit 2,400 4,032 7,488 Operating expenses Advertising expense 400 400 400 Salaries and wages expense 750 920 1,280 Insurance expense 200 200 200 Postage expense 450 756 1,404 Total operating experise 1,800 2,276 3.284 Operating income S 600 $ 1756 S 4,204 (a) Identify each expense as fixed, variable, or mixed. Cost of goods sold varlable Advertising expense foxed Salaries and Wages expense molxed Insurance expense Postage expense mbed vartable (b) Prepare a contribution margin income statement based on a volume of 7.900 windows. (Round unit cost to 2 decimal places, eg and all other answers to 0 decimal places, eg 5,275) Sales Revenue Variable Expenses Cost of Goods Sold v Salarles Expence 14141 7,900 windows $ 5214 Per Unit Advertising expense fixed Salaries and Wages expense mixed Insurance expense mixed Postage expense vartable v (b) Prepare a contribution margin income statement based on a volume of 7,900 windows. (Round unit cost to 2 decimal places, e.g. 52.75 and all other answers to O decimal places, eg. 5,275.) Sales Revenue Varlable Expenses Cost of Goods Sold 14141 Salarles Expense Postage Expense Total Variable Expenses V Contribution Margin Fixed Expenses Advertising Expense Salarles Expense Insurance Expense Total Fixed Expenses Operating Income S 7,900 windows 5214 Per Unit 66 1.79