Posted by **Kate** on Wednesday, April 28, 2010 at 6:26pm.

well yay thanks for the answer but i really need the formula lol I tried to derive it on my own but it was a little bit rough lol

i need the formula it wasn't in my book and I don't know what the name of the formula would be so i can't really google it...

- PreCalculus REINY HELP PLEASE -
**drwls**, Wednesday, April 28, 2010 at 10:19pm
The formula you want can be found here:

http://www.moneychimp.com/articles/finworks/fmbasinv.htm

In that formula, annual investments and interest payment for Y years is assumed. You let Y be the number of months, c be the monthly contribution, and r be the monthly increase factor, and use the same formula.

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