Gabby Company sells a product for $40 per unit. Variable costs are $20 per unit, and fixed costs are $500 per month. The company expects to sell 600 units in September. Calculate the contribution margin per unit, in total, and as a ratio. Calculate the contribution margin per unit. Select the formula labels and then enter the amounts to compute the contribution margin per unit. Net sales revenue per unit Variable costs per unit 40 20 Contribution margin per unit 20 Calculate the total contribution margin. Select the formula labels and then enter the amounts to compute the contribution margin. Net sales revenue Variable costs Contribution margin 40 Calculate the contribution margin ratio. Select the formula labels and then enter the amounts to compute the contribution margin ratio. (Round your answer to the nearest percent, X%.) Contribution margin ratio %