A ten-year par value $20,000 4% bond with quarterly coupons is bought to yield 6% convertible quarterly. Determine the practical dirty and clean values of the bond one month after the twelfth coupon payment using the 30/360 rule.
Solution:
Dirty price is the present value of future coupon payments and maturity value of the bond.
Dirty Price=Price of bond at the last coupon date*(1+YTM)^no. of days since last coupon date/total no. of days in coupon period
No. of payments left=(1*4*10)-12=28 payments
YTM=6%
Coupon amount=$800
Day since last coupon payment=30 days
total no. of days in coupon period=90 days
Price of bond at the last coupon date=Coupon amount*Present valueAnnuity factor @6% for 28th period+Par value*Present value factor@ 6% for 28th period
=$800*13.4062+$20000*.1956
=$10724.96+$3912
=$14,636.96
Dirty Price=$14,636.96*(1+0.06)^30/90
=$14921.13
Accrued Interest=Coupon Amount*Days since last payment/Toatl no. of days between coupon payment
=$800*30/90
=$266.67
Clean price=Dirty Price-Accrued Interest
=$14921.13-$266.67
=$14654.46
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