In what time will Rs- 72 become Rs- 81 at 61-4

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Standard VII

Mathematics

Time and Work

In what time ...

Question

In what time will Rs. $72$ become Rs. $81$ at $6 \frac{1}{4}$ % per annum simple interest?

1 \frac{1}{2}

years

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2

years

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2 \frac{1}{2}

years

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None of these

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Solution

The correct option is D $2$ years
$P = R s . 72, A = R s .81$
$I = A - P = 81 - 72 = R s . 9$
$R = 6 \frac{1}{4}$ % $= \frac{25}{4}$ %
$T = \frac{100 \times I}{P \times R} = \frac{100 \times 9}{72 \times \frac{25}{4}} = 2 y e a r s$

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In what time will Rs. 72 become Rs. 81 at 614% per annum simple interest?

The correct option is D 2yearsP=Rs.72,A=Rs.81I=A−P=81−72=Rs.9R=614% =254%T=100×IP×R=100×972×254=2years

In what time will Rs. $72$ become Rs. $81$ at $6 \frac{1}{4}$ % per annum simple interest?

The correct option is D $2$ years
$P = R s . 72, A = R s .81$
$I = A - P = 81 - 72 = R s . 9$
$R = 6 \frac{1}{4}$ % $= \frac{25}{4}$ %
$T = \frac{100 \times I}{P \times R} = \frac{100 \times 9}{72 \times \frac{25}{4}} = 2 y e a r s$