10. The City of Chatham borrowed $80000 to expand a community centre. The city must pay the interest on the loan at the end of every month and make equal payments at the time of the interest payments into a sinking fund until the loan is retired in 12 years. Interest on the loan is 6% compounded monthly and interest on the sinking fund is 7.5% compounded monthly. (Round all answers to the nearest dollar.) a. Determine the size of the periodic interest expense of the debt. b. Determine the size of the periodic payment into the sinking fund. c. What is the periodic cost of the debt? d. What is the book value of the debt after 8 years