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The simple interest and the true discount on a certain sum for a given time and at a given rate are Rs. 25 and Rs. 20 respectively. The sum is?

Rs. 500
Rs. 200
Rs. 250
Rs. 100

Correct Answer: Rs. 100

Explanation:

Sum = [(S.I.) x (T.D.)] / [(S.I.) - (T.D.)] = Rs. (25 x 20) / (25 - 20)
= Rs. 100

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