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Example: Evaluating Compound Interest

Suppose a principal of $ 10{,}000 is invested in a fund with an annual interest rate of 5%5\% (r=0.05r = 0.05). To find the balance AA in the account after 18 years (t=18t = 18), we use the compound interest formulas.

For quarterly compounding (n=4n = 4):

ight)^{4 \cdot 18}$$, which results in $ 24{,}459.20. For monthly compounding ($$n = 12$$): $$A = 10{,}000\left(1 + \frac{0.05}{12} ight)^{12 \cdot 18}$$, which results in $ 24{,}550.08. For continuous compounding: $$A = 10{,}000 e^{0.05 \cdot 18}$$, which results in $ 24{,}596.03.

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Updated 2026-06-03

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