Solution - Compound interest (basic)

1769076.89

1769076.89

Step-by-step explanation

Use $A = P {(1 + r / n)}^{(n t)}$ with $P = 21, 339$ , $r = 15 %$ , $n = 4$ , $t = 30$ .

Compute period rate and exponent: $\frac{r}{n} = 0.0375$ , $n t = 120$ , so the growth factor is $82.9034580454$ .

Multiply principal by growth factor: $21, 339$ × $82.9034580454$ = $1769076.89$ .

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