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?
$F =\dfrac{BD \times TD}{BD - TD}$= $\dfrac{36 \times 30}{(36 - 30)}$
$=\dfrac{36 \times 30}{6} = 36 \times 5 = Rs.180$
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