Final answer:
The salvage value in a net present value calculation is treated as a positive cash flow in the final year the asset is used and is discounted back to its present value.
Step-by-step explanation:
In a net present value calculation, the salvage value of an asset should be treated as a positive cash flow in the final year that the asset is used. This is because the salvage value represents an inflow of cash that the company will receive from disposing of the asset at the end of its useful life. When calculating the present discounted value, this positive cash flow will be discounted back to its present value, usually with the help of a discount rate corresponding to the cost of capital or rate of return.