**Answer:**

The right equation to determine the NPW is:

= B) NPW = -20000 + 4000(P/A,6%,3) + 5000(P/F,6%,3)

**Explanation:**

a) Data:

Present value cost of production equipment = $20,000

Annual benefits = $4,000

Period of useful life = 3 years

MARR = 6%

Salvage value = $5,000

Present Value Annuity Factor for annual benefits for 3 years at 6% = 2.673

Present Value Factor for Salvage Value after 3 years at 6% = 0.840

Present Value Factor for the initial cost of investment = 1

Therefore, to obtain the NPW of the investment, the correct equation is:

B) NPW = -20000 + 4000(P/A,6%,3) + 5000(P/F,6%,3)

where NPW = Net Present Worth

P/A = Present Value Annuity Factor

P/F = Present Value Discount Factor