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Question
The bankers discount on Rs. 1800 at 12% per annum is equal to the true discount on Rs 1872 for the same time at the same rate. Find the time.
Options:
A .  4 months
B .  5 months
C .  6 months
D .  3 months
Answer: Option A
S.I. on Rs. 1800 = T.D. on Rs. 1872
P.W. of Rs. 1872 is Rs. 1800
Rs. 72 is S.I. on Rs. 1800 at 12%
$$\eqalign{
& {\text{Time}} = \frac{{100 \times 72}}{{12 \times 1800}} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{1}{3}\,{\text{years}} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 4\,{\text{months}} \cr} $$

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