Four years ago you invested some money at 10% interest. You now have $439.23 in the account. If the interest was compounded yearly, how much did you invest 4 years ago?


possibly last question, thanks so much!


We need to solve this for A, the amount originally invested....


439.23  =  A(1.10)^4       divide both sides by (1.10)^4


439.23 / (1.10)^4  =  A   =  $300 



cool cool cool

CPhill  Dec 1, 2017

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