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The bankers discount on Rs. 1600 at 15% per annum is the same as true discount on Rs. 1680 for the same time and at the same rate. The time is:

Options:
A .  3 months
B .  4 months
C .  6 months
D .  8 months
Answer: Option B

S.I. on Rs. 1600 = T.D. on Rs. 1680.


So, Rs. 1600 is the P.W. of Rs. 1680, i.e., Rs. 80 is on Rs. 1600 at 15%.


So, Time = \(\left(\frac{100\times80}{1600\times15}\right)year = \frac{1}{3}year = 4 months.
\)


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