Solution - Compound interest (basic)

92819.68

92819.68

Step-by-step explanation

Use $A = P {(1 + r / n)}^{(n t)}$ with $P = 20, 840$ , $r = 10 %$ , $n = 12$ , $t = 15$ .

Compute period rate and exponent: $\frac{r}{n} = 0.0083333333$ , $n t = 180$ , so the growth factor is $4.4539195517$ .

Multiply principal by growth factor: $20, 840$ × $4.4539195517$ = $92819.68$ .

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