Year to maturity = 9 years
Macaulay duration of a zero coupon bond is always equlas to it's maturity period.
Hence Macaulay duration = 9 years
Modified duration (MD) = Macaulay duration/ 1+YTM
= 9/(1+.718%)
= 8.94
Explanation: bond duration is 8.94 means if interest rate increases by 1% then bond price will fall by 8.94 or vice versa.
Current price (P0) = 100
Price if inst.rate increase by 1% (P+) = 91.06
Price if inst. fall by 1%(P-) = 108.94
Bond convexity=
( P+) +(P-) - 2P0/(2P0* (CHANGE IN INST.) ^2
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