Please help

Former demon (and economics maven) Anya operates the Magic Box, a store that caters to occult tastes. She has an opportunity to expand the Magic Box by purchasing the store next door for $70, 000 thousand ($20, 000 for land and $50, 000 for the building). She will also invest $7, 000 in furniture to display her spooky wares. She estimates a $ 140, 000 annual increase in revenue for only a $4, 000 increase in material purchase cost. Given Anya's discount rate of 15%. what is her estimated net present value for this project over the next twelve years? Include tax and depreciation