Present value of obligation is: 10,300(Cumulative PVF at 8% for two years)=10,300*1.783=$18,367.63
Duration of obligation is 1.4808 years.
The duration of a zero-coupon bond is 1.4808 years would immunize the obligation. $18,367.63(1.08)1.4808=$20,584.82.
If interest obligation increases to 9%, the value of the bond would be $18,118.65 and it changed by $0.19, the same is for if it falls to seven percent.
Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! As well as a great rest of Black History Month! :-)
- Cutiepatutie ☺❀❤