John purchased a black and white $T . V .$ . set on credit. If the set costs $R s 2400$ and the shopkeeper charges interest at the rate of $20 %$ per annum, find the compound interest that John will have to pay after $3$ years .

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Solution

Given that,
A black and white $T . V$ credit cost price $R s .2400$
Charges interest $= 20$ %
Time $= 3$ years
We know that,
$\begin{matrix} A m o u n t = p {(1 + \frac{20}{100})}^{3} = 2400 {(1 + \frac{20}{100})}^{3} \end{matrix}$
$= 2400 \times \frac{120}{100} \times \frac{120}{100} \times \frac{120}{100}$
$= \frac{41472}{10}$
$= 4147.2$
Then,
John wiil have to pay after $3$ years is $1747.2$

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John purchased a black and white T.V.. set on credit. If the set costs Rs 2400 and the shopkeeper charges interest at the rate of 20% per annum, find the compound interest that John will have to pay after 3 years .

Given that,A black and white T.V credit cost price Rs.2400Charges interest =20%Time =3 yearsWe know that,Amount=p(1+20100)3=2400(1+20100)3=2400×120100×120100×120100=4147210=4147.2Then,John wiil have to pay after 3 years is 1747.2

John purchased a black and white $T . V .$ . set on credit. If the set costs $R s 2400$ and the shopkeeper charges interest at the rate of $20 %$ per annum, find the compound interest that John will have to pay after $3$ years .