The net present value of the proposed project is closest to -$80,822.
Since the project saves $80,000 in costs each year, we treat these savings income for the next 4 years. We then calculate the Present value Interest Factor of an annuity using the formula :
PVIF of an annuity = { [ 1 - [ (1+r)⁻ⁿ ] } ÷ r
PVIF of an annuity = { [ 1 - [ (1.09)⁻⁴ ] } ÷ 0.09
PVIF of an annuity = 3.240 (rounded to three decimals)
PV of the cost savings = (3.240*80000) = $2,59,178 (rounded to nearest $)
NPV = PV of cost savings - Value of investment
NPV = 2,59,178 - 3,40,000