7. You expect to receive a generous sign up bonus of $20,000 when you start your first job after graduation in two years. You plan on investing this amount at 10 percent until you have $40,000 net (after tax). The interest is taxed once you make a withdrawal at the end of the investment period. The prevailing tax rate is 30 percent. How long will you have to wait from now to get the required amount? [Round the answer to the nearest year] A. 8 years B. 9 years C. 10 years D. 11 years E. 12 years