Solution - Compound interest (basic)

86897.37

86897.37

Step-by-step explanation

Use $A = P {(1 + r / n)}^{(n t)}$ with $P = 18, 678$ , $r = 15 %$ , $n = 1$ , $t = 11$ .

Compute period rate and exponent: $\frac{r}{n} = 0.15$ , $n t = 11$ , so the growth factor is $4.6523913961$ .

Multiply principal by growth factor: $18, 678$ × $4.6523913961$ = $86897.37$ .

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