Safari File Edit View History Bookmarks Window Help QUESTION 33 The following information is available for Redwood Corporation for a sales volume of 500 stereo speakers for the past month: Sales Less: Variable expenses Contribution margin Less: Fixed expenses Net operating income $112,500 40,000 72,500 $17,500 $55,000 Total Per Unit $225 80 $145 What is the contribution margin ratio? Select one: O A. 40.06 B, 32.2% C. 54.4% D. 64.4% O