The investment manager for a UK defined-benefit pension scheme is considering two bonds about to be issued by a large life insurance company. The first is a 30-year, 4% semiannual coupon payment bond. The second is a 100-year, 4% semiannual coupon payment “century” bond. Both bonds are expected to trade at par value at issuance.
Calculate the approximate modified duration and approximate convexity for each bond using a 5 bp (0.05%) increase and decrease in the annual yield-to-maturity. Retain accuracy to six decimals per 100 of par value.
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