Your construction company is evaluating the proposed acquisition of a new earthmover. A consulting company you hired developed the following analysis last year at a cost to you of $6,000. The earthmover's basic price is $50,000 and will need to be modified for your purposes for another $10,000. The earthmover falls into the 3 year MACRS class and will be sold at the end of 3 years for $25,000. Use of the earthmover will require an immediate increase of $2,000 in spare parts inventory (working capital), which is expected to be fully recovered when the earthmover is sold. The earthmover is expected to save $20,000 in labor costs each year. Your company's marginal tax rate is 34% and your cost of capital is 10%. You must now make a decision. What is this purchase's NPV?