MURDER TO GO! writes 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: Determine the following, showing as part of your answer the formula that you used in your computation. For example, the formula used to determine the contribution margin ratio (part a) is: Contribution Margin Ratio = Unit Sales Price - Variable Costs per Unit/Unit Sales Price a. Contribution margin ratio. b. Sales volume (in dollars) required to break even. c. Sales volume (in dollars) required to earn an annual operating income of $450,000. d. The margin of safety sales volume if annual sales total 40,000 units. e. Operating income if annual sales total 40,000 units