Find the yield to maturity of the following securities:
A. a security paying $ 1000 in one year, for which you pay $926 today ?
B. a security paying $ 80 0ne year from now and $ 1080 two years from now, for which you pay $1,050 today ?
C. a security paying $ 50 every six months for the next five years (beginning six months from now), plus the return of the face value of $1,000 at the end of the five years, for which you pay 1,000 today.