Project Appraisals with negative operating cash flows

I have a question that I am looking at with the following information :

Project Life 10 years

Sales forecast : Year 1 – 1,000
Year 2 – 40,000
Years 3 to 7 – 10,000
Years 8 – 5,000
Year 9 -2,000
Year 10 – 1,000

Unit selling price 5. Variable Cost 3.50. Fixed cost 3,000.
New plant and equipment for the project – 7,500.00; 10 years of useful life, zero salvage value and will be depreciated on a straight line basis.

10% of sales revenue is required for Net Working Capital each year but this investment required now.

Required rate of return 15%.

Calculate: NPV, IRR and Profitability Index.

My calculations for NPV gives me = 8,029 and Net Operating Losses in Years 1, 9 and 10 which I am not sure I am dealing with properly, particularly the taxation aspect of this.

Can someone confirm if I am on the right track?

Thank you