X Company bought a machine three years ago for $140,000 but is considering replacing it with a new, more efficient one. The new machine will cost $161,000. Both machines will last for four more years, and both will be worth zero at that time. The current machine can be sold immediately for $11,000. Operating costs with the current machine are $61,500; operating costs with the new machine are $23,500.

Using a discount rate of 6%, the net present value of replacing the current machine is...?