Solution - Compound interest (basic)

128877.73

128877.73

Step-by-step explanation

Use $A = P {(1 + r / n)}^{(n t)}$ with $P = 24, 421$ , $r = 8 %$ , $n = 4$ , $t = 21$ .

Compute period rate and exponent: $\frac{r}{n} = 0.02$ , $n t = 84$ , so the growth factor is $5.2773321367$ .

Multiply principal by growth factor: $24, 421$ × $5.2773321367$ = $128877.73$ .

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Compound interest appears in savings, loans, and investments. Understanding it builds strong financial literacy.