You are given the following cash flows: $10,000 payable 12/31/2015 $20,000 - payable 12/31/2017 $15,000 - payable 12/31/2018 X is the duration (Macaulay duration) as of 1/1/2015 of the above cash flows, measured at an annual effective interest rate of 6%. Compute X. Possible Answers A 2.72 B 2.76 C 2.79 D 2.82 E 2.84