Question
The banker's discount of a certain sum of money is Rs. 72 and the true discount on the same sum for the same time is Rs. 60. The sum due is:
Answer: Option A
$$\eqalign{
& \frac{{B.D. \times T.D.}}{{B.D. - T.D.}} \cr
& = Rs.\,\left( {\frac{{72 \times 60}}{{72 - 60}}} \right) \cr
& = Rs.\,\left( {\frac{{72 \times 60}}{{12}}} \right) \cr
& = Rs.\,360 \cr} $$
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$$\eqalign{
& \frac{{B.D. \times T.D.}}{{B.D. - T.D.}} \cr
& = Rs.\,\left( {\frac{{72 \times 60}}{{72 - 60}}} \right) \cr
& = Rs.\,\left( {\frac{{72 \times 60}}{{12}}} \right) \cr
& = Rs.\,360 \cr} $$
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