Answer: d. 2.45%
Step-by-step explanation:
The discount yield on an instrument can be calculated by the formula;
Discount Yield = ((Face Value - Selling Price) / Face Value) * 360 / days to Maturity
= ((10,000 - 9,877) / 10,000) * 360/181
= 0.0123 * 360/181
= 2.45%