You have discovered that when the required rate of return on a bond you own fell by 0.5 percent from 8.1 percent to 7.6 percent, the fair present value rose from $945 to $965. The bond pays interest annually. What is the duration of this bond? Assume annual payments. (Do not round intermediate calculations. Round your answer to 1 decimal place. (e.g., 32.1)). What is the duration in years?