A 4.year government bond makes annuat coupon payments of 4.5% and offers a yleld of 2.5% annually compounded. Assume face value is $1,000. Note: Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places. a. Suppose that one year later the bond still yelds 2.5%. What return has the bondholder earned over the 12 -month period? b. Now suppose thot the bond yelds 1.5% ot the end of the year. What return did the bondholder earn in this case