You are given the following: The valuation date is December 31, 2017. The bond matures on June 30, 2019. The annual coupon rate is 7.5%. The effective annual yield is 5.50%. Find the Macaulay duration. (Hint: The next coupon payment will be on June 30, 2018.) a) 1.41 b) 1.43 c) 1.45 d) 1.91 e) 1.93