Frank's Auto Supply Company sells cases of gaskets for $140 The unit variable costs per care are 365 phn a seting common of 10 percent of per month The company has a tax rate of 25% Required What is the contribution margin per case? What is the break-even point in cases? How many cases must be sold to earn pre-tax profit of $9.0002 d: How many cases must be sold to earn an after tax income of $9.000