### Project NPV and Payback Period

I am evaluating the project with cash inflows as shown below. My boss has asked me to calculate the projects NPV. I don't know the projects initial cost, but I have been informed that the project's payback period is 3.5 years If the project's WACC is 9.9% what is its NPV Cashflows CF = 0 CF1 = 500 CF2 = 800 CF3 = 800