Question

at what price treasury bills are issued ​

Answer 1

Answer:

Instead, they are issued at a discount and redeemed at the face value at maturity.

If you want an example then see this:-

a 91 day Treasury bill of ₹100/- (face value) may be issued at say ₹ 98.20, that is, at a discount of say, ₹1.80 and would be redeemed at the face value of ₹100/-.