The net present value of the project can be calculated as follows:
NPV = - Cost + present value of all cash flows
Cost = $350,000
Present value of all cash flows = C*{[1-(1+r)^-n]/r}
Where C = Yearly cash flows = $140,000, r = discount rate = 9%, n = time of generating cash flows = 3 years.
Therefore,
NPV = -350,000 + 140,000*{[1-(1+0.09)^-3]/0.09} = $4,381.25