7. A company's sales revenue is $520,000 and its total (fixed and variable) costs are $310,000 during May, a month of low sales and production activity (1,700 units). Total (fixed and variable) costs are $990,000 during June, a month of high sales and production activity (6,200 units). If the high-low method is used. Calculate the company's contribution margin ratio for the month of May (round to 0.00)