Salina Hadad bought a 4-year bond with the following information: Its returns in the first year is 12 percent of its cost in PV terms 11 percent in the second year; 10 percent in the third year and the remainder in the fourth year. What is the bond's duration in years? 4.50 years 3.98 years 3.32 years 4.00 years 2.75 years