The banker's gain of a certain sum of money is Rs. 36 and

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The banker's gain of a certain sum of money is Rs. 36 and the true discount on the same sum for the same time and at the same rate is Rs. 30. The sum is ?

1. Rs. 1080
2. Rs. 180
3. Rs. 500
4. Rs. 300

Correct Option: B

Sum = (B.D. x T.D.) / (B.D. - T.D.) = Rs. (36 x 30) / 6
= Rs. 180