Simple

 So interest rates go up, and you want to sell a bond.

You will need to sell the bond at a discount to make it

viable in a higher interest rate world. For the math, going from

2% a year compounded 5 years, to 3% a year compounded 5.

The math:

100 * (1.02^5) = x * (1.03^5)

x/100 = (1.02^5) / (1.03^5)

x = 95.24

The new price, 95.24.

Expressed a simple yield:

                                                       

Under the hood: