A company issued bonds worth $750,000, with a coupon rate of 7%, and set up a sinking fund to retire the debt in 15 years. It made deposits at the end of every 6 months into the fund, and the fund was earning 8.2% compounded semi-annually. 1. Find the periodic expense of the debt. 2. Find the book value of the debt after 8 years. 3. Construct the sinking fund schedule for the 10th year