1. (10points) On May 1,2015 , a bond with par value 1000 and annual coupons at 5.375% were purchased to yield an effective annual interest rate of 5\%. On May 1, 2030, the bond is redeemable at 1100 . The book value of the bond is adjusted each year so that it equals the redemption value on May 1, 2030. Calculate the amount of write-up or write-down in the book value in the year ending May 1, 2021