Oriole sells a learning system that helps preschool and elementary students learn basic math facts and concepts, The company's income statement from last month is as follows: Total Per Unit Sales revenue $715,000 $55 Variable expenses 321,750 24.75 Contribution margin 393,250 $30.25 Fixed expenses 244,750 Operating income $ 148,500 (a) What is Oriole's contribution margin ratio? Its variable cost ratio? (Round ratios to 2 percentage places, e.g. 0.38 = 38%.) Contribution margin ratio %