The contribution margin ratio: O a. Cannot be used in conjunction with other analytical tools. O b. Is the percent of each sales dollar that remains after deducting total unit fixed cost. O c. Is the percent of each sales dollar that remains to cover fixed costs and contribute to the managers incomes. O d. Is the percent of each sales dollar that remains after deducting total unit variable cost. o e. Is the same as the unit contribution margin. Dunkin Company manufactures and sells a single product that sells for $480 per unit; variable costs are $300. Annual fixed costs are $990,000. Current sales volume is $4,200,000. Compute the contribution margin ratio. O a. 47.5% O b. 37.5% C. 62.5%. O d. 50.0% O e. 55.0%