How much will Clemens have if he allows his investment to remain in the index fund for 10 years?

Let's think of it another way so that we can see the impact of compounding on this investment. For simplicity's sake, we'll assume that Adrian's rate of return is effectively 5.7% annually (7% - 1.3% fee) and Clemens's rate is effectively 6.8% annually (7% - 0.2% fee). Each man contributes an additional $100/month into their investment account. Use the compound interest calculator to answer these questions. You can round to the nearest whole dollar and assume the investment compounds annually.