Solution - Compound interest (basic)

68688.67

68688.67

Step-by-step explanation

Use $A = P {(1 + r / n)}^{(n t)}$ with $P = 21, 178$ , $r = 4 %$ , $n = 1$ , $t = 30$ .

Compute period rate and exponent: $\frac{r}{n} = 0.04$ , $n t = 30$ , so the growth factor is $3.24339751$ .

Multiply principal by growth factor: $21, 178$ × $3.24339751$ = $68688.67$ .

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