Question: Formula for calculating interest? Variables known: \nInitial investment ($2,000)\nadditional monthly investment ($500)\nyearly interest rate (3.5%)\n\nWant to find:\nbalance in n (10) years.\n\nPlease include formulas and solve with the numbers given as an example.

Answer: OK Sorry I missed the $500\n\nSo for the initial $2000 you do this:\n\nFV = PV(1+r) to the nth power where\n\nr = interest rate = 0.035\nn = number of periods = 10\nPV = present value = 2000\n\n$2821.\n\nNow the $500 gets REALLY hard, because it is like getting 120 individual investments of $500 each, each having a different period of investment, with an interest rate of 3.5/12 % per month!\n\n\nThis is a really complex equation. Each of the 120 terms is like the first formula.\n\nMaybe the second link will help?
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