Answer:
3.703716
Step-by-step explanation:
The duration can be calculated by dividing the present value of cash flow over time by the present value of cashflow.
Time Cash flow PV of CF PV of CF X t
1 60 $59.41 $59.41
2 60 $58.82 $117.64
3 60 $58.24 $174.71
4 1060 $1,018.64 $4,074.56
Total $1,195.10 $4,426.30
Duration = 4426.30/1195.1
Duration = 3.703716