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One of the most helpful identities I have found for exam FM
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So in my readings as I attempt to find the rate of discount or interest for various problems, there is an identity that my particular lesson material kind of glossed over but I feel is very important. That is the following: accumulation function times the discount function equals 1.

With this identity, several things become clear. Finding the formulas for compound interest and discount, that simple interest and discount are not constants, and it’s a great way to check your answer.

If I am saying stuff everyone already knows, I am sorry but this just seemed a really useful tool that does not get mentioned.

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4 years ago