please help with this practise test

4) You are a seismic company. You are considering buying a new thumper truck for $500,000, which you will use to perform seismic activities on customers' properties. The truck has a useful life of 8 years and no salvage value. It will allow you to complete projects that generate $250,000 in sales each year and have costs totaling $65,000 annually. The company requires a 15% hurdle rate. Calculate the NPV. (4 points)