1. The problem statement, all variables and given/known data If you invest a dollar at 6% interest compounded monthly, it amounts to (1.005)^n, where n=# of months. If you invest 10$ at the beginning of each month for 10 years (120 months), how much do you have at the end of the 10 years? 2. Relevant equations sum of a geometric series - a/(1-r) 3. The attempt at a solution The only examples of this I've seen were when the same amount is being compounded. I don't understand how I would sum up the total if money is being added each month.