True Discount - General Questions

Find the true discount on Rs. 2,640 due 1 year(s) hence at 10% per annum.

The true discount on a bill due 3 year(s) hence at 12% per annum is Rs. 1,296. What is the amount of the bill?

Find the true discount on Rs. 2,332 due 1 year(s) hence at 6% per annum.

The true discount on a bill due 3 year(s) hence at 10% per annum is Rs. 1,020. What is the amount of the bill?

What is the present worth of Rs. 6,720 due in 3 year(s) at 4% per annum simple interest?