You are given:
(a) A 10-year 8% semiannual coupon bond is purchased at a discount of X.
(b) A 10-year 9% semiannual coupon bond is purchased at a discount of Y.
(c) A 10-year 10% semiannual coupon bond is purchased at a discount of 0.5X.
(d) All bonds were purchased at the same yield rate, have par values of $1000 and redeemable at par. Calculate Y.
Please use specific math formula TO DO IT instead of using the financial calculator. Thank you!! I will rate it if it's correct. !!
From a)
8%*1000/r*(1-1/(1+r/2)^(2*10))+1000/(1+r/2)^(2*10)=1000-X
From b)
9%*1000/r*(1-1/(1+r/2)^(2*10))+1000/(1+r/2)^(2*10)=1000-Y
From c)
10%*1000/r*(1-1/(1+r/2)^(2*10))+1000/(1+r/2)^(2*10)=1000-0.5X
Subtracting a from c we get
2%*1000/r*(1-1/(1+r/2)^(2*10))=0.5X d)
Substituting in a we get
2X+1000/(1+r/2)^(2*10)=1000-X
=>1000/(1+r/2)^(2*10)=1000-3X e)
Substituting e in d we get
2%*1000/r*(1-(1000-3X)/1000)=0.5X
=>2%*1000/r*(3X/1000)=0.5X
=>2%/r*(3)=0.5
=>r=2%*3/0.5
=>r=12%
X=-(1000/(1+12%/2)^(2*10)-1000)/3=229.3984244
Adding a and c we get
18%*1000/r*(1-1/(1+r/2)^(2*10))+2000/(1+r/2)^(2*10)=2000-1.5X
Dividing by 2 we get
9%*1000/r*(1-1/(1+r/2)^(2*10))+1000/(1+r/2)^(2*10)=1000-0.75X
This is same as b
Hence, Y=0.75X=0.75*229.3984244=172.0488183
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