Twelve years ago, you deposited $25,500 into an investment fund. Five years ago, you added an additional $15,000 to that account. You earned 9%, compounded semi-annually, for the first 12 years, and 7.5%, compounded annually, for the last five years. Required: a. What is the effective annual interest rate (EAR) you would get for your investment in the first 12 years? b. How much money do you have in your account today? c. If you wish to have $75 000 now, how much should you have invested 17 years ago?