Problem 1: DHL currently delivers packages for $9 each. The variable cost is $3 per package, and fixed costs are $60,000 per month. Compute the break-even point in both sales dollars and units under each of the following independent assumptions. Which assumption do you recommend and why? 1- The costs and selling price are the same as given. 2- Fixed costs are increased to $75,000. 3- The selling price is increased by 10%. (Fixed costs are $60,000.) 4- Variable cost is increased to $4.50 per unit. (Fixed costs are $60,000 and the selling price is $9.)