Question

Find the interest and the rate per cent.

$Principal$	$Amount$	$SI$	$Time$	$Rate$
$Rs.10,000$	$Rs.11,800$		$2$ YEARS

Answer 1

$A=11800$,

$P=10000$

$T=2$years

$A=P(1+rt)$

$11800=10000(1+2r)$

$\frac{11800}{10000}=1+2r$

$1.18=1+2r$

$1.18-1=2r$

$2r=0.18$

$r=\frac{0.18}{2}$

$r=0.09$

$R=0.09\times 100=9\%$

Simple Interest$=$I

I$=A-P$

$=11,800-10,000$

$I=1800$.