The present cost of a mobile phone is $R s .15000$ . If tits value decreases every year by $5 %$ , find the cost $2$ year ago.

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Solution

$P = 15, 000$
$R = 5 %$
$T = 2 y e a r s$
Since value decreases every year the value will increase as you go in past.
$A = P {[1 + \frac{R}{100}]}^{n}$
$= 15000 {[1 + \frac{5}{100}]}^{2}$
$= 15000 {[\frac{21}{20}]}^{2}$
$= 15000 \times \frac{441}{400}$
$= \frac{150 \times 441}{4}$
$= R s . 16, 537.5$

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The present cost of a mobile phone is Rs.15000. If tits value decreases every year by 5%, find the cost 2 year ago.

P=15,000R=5%T=2yearsSince value decreases every year the value will increase as you go in past.A=P[1+R100]n =15000[1+5100]2 =15000[2120]2 =15000×441400 =150×4414 =Rs.16,537.5

The present cost of a mobile phone is $R s .15000$ . If tits value decreases every year by $5 %$ , find the cost $2$ year ago.