1.  The banker's discount on ₹ 1600 at 15% per annum is the same as true discount on ₹ 1680 for the same time and at the same rate. The time is:
A. 3 months
B. 4 months
C. 6 months
D. 8 months

Answer: Option B

Explanation:

S.I. on ₹ 1600 = T.D. on ₹ 1680.

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

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