11.
The present worth of a sum due sometime hence is Rs. 576 and the banker's gain is Rs. 16. The true discount is:

12.
The true discount on a bill of Rs. 540 is Rs. 90. The banker's discount is:

13.
The banker's discount on a certain sum due 2 years hence is $$\frac{{11}}{{10}}$$ of the true discount. The rate percent is:

14.
If the true discount on a certain sum due 6 months hence at 15% is Rs. 120, what is the banker's discount on the same sum for the same time and at the same rate?

15.
The present worth of a bill due sometime hence is Rs. 1100 and the true discount on the bill is Rs. 110. Find the banker’s discount and the banker’s gain.