10 points Save Ans Frank's Auto Supply Company sells cases of gaskets for $140. The unit variable costs per case are $65 plus a selling commission of 10 percent of sales. Fixed costs are $2.500 per month The company has a tax rate of 25% Required: a. What is the contribution margin per case? b. What is the break-even point in cases? c. How many cases must be sold to earn pre-tax profit of $9,000? d. How many cases must be sold to earn an after-tax income of $9.000? TT T Arial 3 (12pt) T