Calculating Average Operating Assets, Margin, Turnover, and Return on Investment

East Mullett Manufacturing earned operating income last year as shown in the following income statement:

Sales	$531,250
Cost of goods sold	280,000
Gross margin	$251,250
Selling and administrative expense	190,200
Operating income	$61,050
Less: Income taxes (@ 40%)	24,420
Net income	$36,630

At the beginning of the year, the value of operating assets was $390,000. At the end of the year, the value of operating assets was $460,000.

Required:

For East Mullett Manufacturing, calculate the following:

1. Average operating assets
2. Margin (round to two decimal places)
3. Turnover (round to two decimal places)
4. Return on investment (round to one decimal place)