< You will need a calculator for this problem. Sanchez earns $4,000, and she wants to save it for retirement, which is 10 years away. She can either save it in a taxable account or put it into a Roth IRA. Suppose that Sanchez can receive an annual rate of return of 8 percent and her marginal tax rate is 25 percent. By the time she reaches retirement, how much money would she have in either option? [Note: Sanchez has to pay tax on the $4,000, so she cannot put the full amount either into the taxable account or the Roth IRA.]