Please use Excel to explain, thank you!

Kinky Copies may buy a high-volume copier. The machine costs $170,000 and this cost can be fully depreciated immediately. Kinky anticipates that the machine actually can be sold in 5 years for $37,000. The machine will save $30,000 a year in labor costs but will require an increase in working capital, mainly paper supplies, of $15,000. The firm's marginal tax rate is 21%, and the discount rate is 7%. (Assume the net working capital will be recovered at the end of Year 5.) What is the NPV of this project? (Negative amount should be indicated by a minus sign. Do not round intermediate calculations. Round your answer to 2 decimal places.)