Bond ZZZ is trading at par, hence the yield to maturity=10% which is equal to coupon rate. Moreover the bond of ZZZ tardes at par=$1000

Bond TTT, yield to matuirty is also be 10% because of same risk.

Use PV function in EXCEL to find the Bond TT price

=PV(rate,nper,pmt,fv,type)

rate=10%;nper=15 years

pmt=coupon arte*face value=12%*1000=120

fv=1000

=PV(10%,15,120,1000,0)=1152.12

==> if interest rate increases by 1.5%, then yile dto maturity becomes 11.5%

Bond price of ZZZ:=PV(11.5%,15,100,1000,0)=895.05

The percentage change in Bond ZZZ:(895.05-1000)/1000=-10.50%

Bond price of TTT=PV(11.5%,15,120,1000,0)=1034.98

The percentage change in Bond TTT=(1034.98-1152.12)/1152.12=-10.17%

Bond TTT cahnges lower than Bond ZZZ because of higher coupon payments. Bonds with higher coupon paymnets will flucutate low when comapred to bond's with lower coupon payments when interest rate changes.