Percentage Change in Price if Yield changes from 6 to 5 % ?

What is the percentage change in the price of each bond if its yield to maturity falls from 6%
to 5%?

P (A) to P(B)

Since Price and Yield are inversely proportional therefore:-

Zero Coupon Bond
1 + YTM =  (FV/P)^1/n

P (b) / P(a)   - 1  = { (1+r(a)  / (1+r(b)) }^n - 1
i.e

{1.06/1.05}^15 -1

-------------------------------------------x