2.  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:  
Answer: Option B 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%.

3.  The banker’s gain of a certain sum due 2 years hence at 10% per annum is Rs. 24. The present worth is:  
Answer: Option C Explanation:

4.  The banker’s discount on a sum of money for 1 years is Rs. 558 and the true discount on the same sum for 2 years is Rs. 600. The rate percent is:  
Answer: Option C Explanation:
T.D. for 2 years = Rs. 600.
Thus, Rs. 744 is S.I. on Rs. 3100 for 2 years.

5.  The banker’s gain on a sum due 3 years hence at 12% per annum is Rs. 270. The banker’s discount is:  
Answer: Option C Explanation:
B.D. = Rs.(750 + 270) = Rs. 1020. 