Ontario Credit Union borrowed $258,000 at 12.05% compounded semi-annually from League Central to build an office complex. The loan agreement requires payment of interest at the end of every six months. In addition, the credit union is to make equal payments into a sinking fund so that the principal can be retired in total after 18 years. Interest earned by the fund is 9.15% compounded semiannually. (Round all answers to the nearest dollar.) a.) What is the semi-annual interest payment on the debt? b.) What is the size of the semi-annual deposits into the sinking fund? c) What is the total annual cost of the debt? d.) What is the interest eamed by the fund in the 11 th payment interval? e.) What is the book value of the debt after 14 years