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The derivative is at*ln(a) wheret is the time period,

ln is the natural log

and a is the multiplier for the annual interest rate: eg if the interest rate is r% then a = (1 + r/100).

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6y ago
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6y ago

Actually if it's compounded annually, there is NO change most of the time - until the end of the year. However, you can approximate this as an exponential function, and take the derivative, as Anand Mehta explained in another answer.

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Q: How do you determine the instantaneous rate of change of compound interest compounded annually?
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