A machine will generate $$150$ in net sales $($net sales$=$sales$-$costs$)$ at the end of each

yr for $20$ years. At the beginning of each year, you must have NWC equal to $20\%$ of

end$-$of$-$year net sales. The machine costs $$2000$ and depreciates to zero over $20$ years. You think you can sell the machine for $$400$ after $20$ years. Tax rate is $35\%$

Investors require $9\%$ return. What is NPV$?$

Please show all steps