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The bankers discount of a certain sum of money is Rs. 36 and the true discount on the same sum for the same time is Rs. 30. What is the sum due?

Rs. 180
Rs. 120
Rs. 220
Rs. 200
Explanation:

$F =\dfrac{BD \times TD}{BD - TD}$= $\dfrac{36 \times 30}{(36 - 30)}$

$=\dfrac{36 \times 30}{6} = 36 \times 5 = Rs.180$

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