Problem 4-21 The Investments Fund sells Class A shares with a front-end load of 4.5% and Class B shares with 12b-1 fees of 1% annually as well as back-end load fees that start at 5% and fall by 1% for each full year the investor holds the portfolio (until the fifth year). Assume that you have $1,000 to invest and the portfolio rate of return net of operating expenses is 15% annually. a-1. If you invest in each fund and sell after 4 years, how much will you receive from each sale? (Round your answers to 2 decimal places.) Amounts Class A Class B a-2. Are Class A or Class B shares the better choice for you? Class A Class B b-1. If you invest in each fund and sell after 15 years, how much will you receive from each sale? (Round your answers to 2 decimal places.) Amounts Class A Class B b-2. Are Class A or Class B shares the better choice for you? Class A Class B