Please show all work, thanks!!

You're considering opening a restaurant that would generate $120,000 in sales starting in year 1. You would need to spend $9,000 on inventory today, which would remain constant until the last year (year 4) when you would sell all inventory. The costs to run the restaurant would be $90,000 each year. You also want to buy a catering truck, which would cost $45,000 today and depreciate fully and evenly by year 4 . If you have a tax rate of 34% and a discount rate of 15%, what is the NPV of this project