Consider a piece of equipment for which the expenditure at the beginning of period 1 is $55,000. Given that this is a cost, consider it as a negative in a net revenue framework.

The net revenue at the end of year 1 is $10,000.

The net revenue at the end of year 2 is $18,000

The net revenue at the end of year 3 is $24,000

The net revenue at the end of year 4 is $35,000. This includes revenue from operations and sale of the used equipment.

The interest rate is 6%.

What is the net present value of this net revenue stream?