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The banker's 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:

Correct Answer: 4 months

Explanation:

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


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



∴ Time = 100 x 80 ❩year = 1 year = 4 months.
1600 x 15 3


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