Exercise 2-17 (Part Level Submission) Erin Brushwood sells gourmet chocolate chip cookies. The results of her last month of operations are as follows: Sales revenue $ 49,742 Cost of goods sold (all variable) 25,443 Gross margin 24,299 Selling expenses (20% variable) 8,239 Administrative expenses (60% variable) 11,152 Operating income $ 4,908 What is Erins contribution margin ratio? (Round contribution margin ratio to 2 decimal places, e.g. 52.75%.) Contribution margin ratio %