24.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 :
A. 2 months B. 4 months C. 6 months D. 7 months
Answer: B.
Explanation:
S.I. on Rs. 1600 = R.D. on Rs. 1680.
∴ Rs. 1600 is the P.W. of Rs. 1680, i.e., Rs. 80 is S.I. on Rs. 1600 at 15%.
∴ Time = [100 * 80 / 1600 * 15] year = 1/3 year = 4 months.
