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The B.D. and T.D. on a certain sum is Rs.200 and Rs.100 respectively. Find out the sum.

Rs. 400
Rs. 300
Rs. 100
Rs. 200

Correct Answer: Rs. 200

Explanation:

$F = \frac{B D \times T D}{B D - T D} = \frac{200 \times 100}{200 - 100} = \frac{200 \times 100}{100} = R s . 200$

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