Assume a company pays tax at a rate of 20% on its first $50.000 of income. Any income above $50.000 is taxed at 25%. If a company has $75,000 of taxable income, which of the following statements is correct? A. Its average tax rate is 21.67% B.Its marginal tax rate is 18.33% C. Its average tax rate is 18.33% D. Its marginal tax rate is 15%