Exercise 20.7 (Static) Using Cost-Volume-Profit Formulas (LO2O-4, LO2O-5, LO20-6) MURDER TO GO! writes and manufactures murder mystery parlor games that it sells to retail stores. The following is per-unit information relating to the manufacture and sale of this product: Required: a. Determine the contribution margin ratio. b. Determine the sales volume (in dollars) required to break even. c. Determine the sales volume (in dollars) required to earn an annual operating income of $440,000. d. Determine the margin of safety (in dollars) if annual sales total 60,000 units. e. Determine the operating income if annual sales total 60,000 units