Ivanhoe 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 $689,000 $53 Variable expenses 275,600 21.20 Contribution margin 413,400 $31.80 Fixed expenses 279,000 Operating income $ 134,400 (a) What is Ivanhoe's contribution margin ratio? Its variable cost ratio? (Round ratios to 2 percentage places, e.g. 0.38 = 38%.) Contribution margin ratio Variable cost ratio % %