You have an idea that requires an investment in a fixed asset of $400 today. The asset depreciates to zero over 20 years. It will produce $150 in sales and $30 in maintenance costs at end of each of year. The project ends after 20 years, at which point you can sell the fixed asset for $100. At the beginning of each year, you need to have NWC equal to 20% of end-of-year sales. Tax rate is 35%. Discount rate is 13%. What is NPV of this investment?