NO maturity date is given,
so it can be assumed that it is a perpetual bond,
so in this case if we assume face value of rs 110 then the investor is geting 11 as his interest at 10 % interest, as market price is 110 ,his cost of capital is also 10 %.now when cost of capital rises to 11% ,the market price would be 100 as he would get his interest of Rs 11. even if we assume any amount as the face value the result would be more or less the same.
in case of a perpetual bond market prices fluctuate according to the prevailing interest rates .
if this was not a perpetual bond then the market price of the bond will not fluctuate much by a rise of 1 % interest.
the value of a perpetual bond is
fixed interest /discount rate.
so when discount rate is 10 %
market price is 11/0.1=110
when discount rate is 11%
market price is 11/0.11 =100