The Capital$-$Ideas Company is in its development stage and is deciding how to formally organize its business venture. The founder, Rolf Lee, is considering organizing as either a proprietorship or a corporation. He expects revenues to be $$2$ million next year with total expenses amounting to $$1,625$ million, resulting in a taxable income of $$375,000.$ Rolf is interested in estimating his federal income tax liability based on the schedules contained in Figure $3\mathrm{.}6.$

A$.$ Calculate the amount of federal income tax that Rolf would pay if Capital$-$Ideas is organized as a proprietorship. What would be the marginal tax rate on the last dollar of taxable income and what would be the average tax rate?

B$.$ Calculate the amount of federal income tax that the Capital$-$Ideas Company would have to pay if the venture is organized as a regular corporation. What would be the marginal tax rate on the last dollar of taxable income and what would be the average tax rate?