31.
A bill is discounted at 10% per annum. If banker's discount is allowed, at what rate percent should the proceeds be invested so that nothing will be lost?

32.
If the discount on Rs. 498 at 5% simple interest is Rs.18, when is the sum due?

33.
The banker's discount of a certain sum of money is Rs. 36 and the true discount on the same sum for the same time is Rs. 30. What is the sum due?

34.
The banker's gain on a sum due 3 years hence at 12% per annum is Rs. 360. The banker's discount is:

35.
The Banker Gain on a certain sum 4 years hence at 5% is Rs. 200. What is the present worth?