On average, a mutual fund will earn about 7% interest compounded monthly in a long-term investment strategy. The key in planning for your financial future in retirement is to start early. Suppose you are a 22-year-old student and you wish to retire at age 65. That leaves 43 years for an initial investment to grow with compound interest. 2. (3 pt) Calculate how much you will have in the account with an initial investment of $5,000 at 22 years old