Simple and compound interest

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Simple interest

$SI = P*R*T/100$

P= principal amount
R = rate/unit
T = time/year month day etc.

Compound interest

$CI = P(1+\frac{R}{100})^n$
P= principal amount
R= rate/unit
T= time unit

Where rate are difference for different unit or time.

Than $C.I = p(1+\frac{R1}{100}) (1+\frac{R2}{100}) (1+\frac{R3}{100}) ……….$

Present worth of Rs x lac in year hence is given by present worth=
$\frac{x}{(1+\frac{r}{100})^n}$