a. Someone in the 36 percent tax bracket can earn 7 percent annually on her investments in a tax-exempt IRA account. What will be the real value of a one-time $18,000 investment in 5 years? 10 years? 20 years? Assume that the rate of inflation during all these periods was 5 percent a year. You may use Appendix C to answer the questions. Do not round intermediate calculations. Round your answers to the nearest dollar. in 5 years: $ in 10 years: \$ in 20 years: $ b. Someone in the 15 percent tax bracket can earn 12 percent annually on his investments in a tax-exempt IRA account. What will be the real value of a one-time $18,000 investment in 5 years? 10 years? 20 years? Assume that the rate of inflation during all these periods was 5 percent a year. You may use Appendix C to answer the questions. Do not round intermediate calculations. Round your answers to the nearest dollar. in 5 years: $ in 10 years: $ in 20 years: \$