In: Finance
a) Expected value of interest rate after one year = 0.7*6%+0.3*10% = 7.2%
So, Expected value of perpetual bond after one year = 81/0.072 = $1125
Current market value of bond = 81/1.08+1125/1.08 = $1116.67
b) Let the coupon rate of the bonds be c% p.a.
Annual coupon = 10* c
If interest rate rises and bonds are not called (probability of 30%)
Value of bond after one year = 10*c/0.1 = 100*c
Current market value of bond = 10*c/1.08+100*c/1.08 =101.85*c
If interest rate falls and bonds are called (probability of 70%)
call premium = 2*10*c = 20*c
Current market value of bond = 10*c/1.08+(1000+20*c)/1.08 =925.93 +27.78*c
Expected value of bond = 0.3*101.85*c + 0.7* (925.93+27.78*c) = 1000
=> 30.5556*c + 19.4444*c +648.14815 = 1000
=> 50*c = 351.85
c = 7.037
So, coupon rate must be 7.037%
c) If there was no call provision (bond could not be called) and the coupon rate was 7.037%
Expected value of perpetual bond after one year = 70.37/0.072 = $977.366
Current market value of bond = 70.37/1.08+977.366/1.08 = $970.13
Thus, value of call provision = value of callable bond - value of bond without call provision
= $1000 - $970.13
=$29.87