In September, Cullumber Industries sold 800 units of product. The average sales price was $45. During the month, fixed costs were $6,615 and variable costs were 75% of sales. (a) Determine the contribution margin in dollars, per unit, and as a ratio. (Round Contribution margin to O decimal places, eg. 5,275. Other all answers to 2 decimal places, eg. 52.75.) Contribution margin (in dollars) Unit contribution margin Contribution margin ratio 69 $ $ 69 %