5. A debt of $250,000 is to be repaid after 5 years. If the interest is charged at 5% compounded semi-annually, a sinking fund is created at a rate of 6% compounded semi-annually. Find: a) the semi-annual cost by the sinking fund method; b) the semi-annual cost by amortization; c) Did the borrower made the right decision in setting up a sinking fund? Justify your answer.