A 3-year maturity bond with a face value of $1,000 makes annual coupon payments of $80 and is selling at face value. What is the current yield of the bond? What is the yield to maturity if interest is paid once a year? What will be the rate of return on the bond if its yield to maturity at the end of the year is 6%? Suppose that the market interest rate is 8% and then drops overnight to 4%. Calculate the present values of a 7.5% coupon rate