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Simple & Compound Interest
O-Level E Math
Simple Interest
$$I = \dfrac{PRT}{100}$$
where $P$ = principal, $R$ = rate (%), $T$ = time (years)
Compound Interest
$$A = P\left(1 + \dfrac{r}{100}\right)^n$$
where $P$ = principal, $r$ = rate (%), $n$ = number of compounding periods
Formulas for the Singapore O-Level Elementary Mathematics syllabus