The true discount on a bill due 9 months hence at 12% per annum is Rs 540. Find the amount of the bill and its present worth

The true discount on a bill due 9 months hence at 16% per annum is Rs189. The amount of the bill is (a) Rs 1386 (b) Rs 1764 (c) Rs 1575 (d) Rs 2268

The true discount on a bill 24 months, hence at 24% per annum, is X 144. What will be the banker's discount?

The true discount at a bill of X 7440 due 16 months, hence is X 240. Find the banker's gain.