Banker's Discount - General Questions

The banker's discount on a sum is Rs. 960 and the true discount is Rs. 800. What is the sum due?

What is the banker's discount on a bill of Rs. 10,100 due 6 months hence at 10% per annum?

What is the banker's discount on a bill of Rs. 9,300 due 3 months hence at 6% per annum?

The banker's discount on a sum is Rs. 228.48 and the true discount is Rs. 204. What is the sum due?

The true discount on a bill due 1 year(s) hence at 15% per annum is Rs. 750. What is the banker's gain?