Seven years ago the Sheraton Company issued 20-year bonds with a 12% annual coupon rate at their $1,000 par value. The bonds had an 5% call premium. Today (8 years since the bonds were issued), the bonds were called. Compute the realized rate of return for an investor who purchased the bonds when they were issued and held them until they were called. Would the investor be happy that the bonds were called early? Why or why not?

PLEASE SHOW WORK, EXPLANATION AND EQUATIONS