Kiakaha

BDY = D/F X 360/t

HPY = (P1 - P0 + D1)/P0 - 1

Therefore to calculate HPY, you need to know P1 and P0.

From BDY and the question given, face value = P1.

As for P0, you need to calculate it. Question might give you BDY and you just have to solve for D and uses D to solve for P0. Question might also give you D and BDY and not telling you the face value.