Given:
Duration = 10 years
Yield to maturity = 10%
To find: Bond volatility.
Solution:
Volatility (in percentage) = Duration / (1+yield)
Now putting values in the formula,
10 / (1+10%)
10/ (1+10/100)
10/(1+0.1)
10/1.1 = 9.09%
So, bond volatility is 9.09%.