If you could provide an explanation, I would appreciate that!

Trident Company expects annual operating income of $35,000 per year for 6 years from a machine that costs $130,000. The machine has an expected residual value at the end of 6 years of $10,000. In calculating the net present value of this investment, what amount would be used for annual cash inflows? $20,000 $55,000 $35,000 $15,000