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Q.

Equal sums of money were lent to A and B at 15% rate for 3 1/2 years and 5 years. If the difference between the interests paid by them was Rs. 144. Find the sum.

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a

Rs. 600

b

Rs. 500

c

Rs. 640

d

Rs. 580

answer is B.

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Detailed Solution

$\frac{x \times 15 \times 5}{100} - \frac{x \times 15}{100} \times \frac{7}{2} = 144$

$\frac{150 x - 105 x}{200} = 144$

$45 x = 144 \times 200$

$x = 640$

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