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The net present value method of evaluating investment projects uses discounted expected net cash flows, not accounting profit.
This is the definition of the net present value of an investment budgeting project.
The net present value of an investment project uses expected future cash inflows and expected future cash outflows, not actual inflows and outflows. Furthermore, the expected future cash inflows and expected future cash outflows are discounted to the present.
The expected values of these items are included in the calculation of the net present value of an investment, but they are not its net present value.