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where the initial investment is <math>A(0).</math>
For various interest-accumulation protocols, the accumulation function is as follows (with ''i'' denoting the [[interest rate]] and ''d'' denoting the [[annual effective discount rate|discount rate]]):
*[[simple interest]]: <math>a(t)=1+t \cdot i</math>
*[[compound interest]]: <math>a(t)=(1+i)^t</math>
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