I need answer for 1-8 ASAP please

1-8 A used pumping unit is purchased to replace a smaller unit. It has a useful life of five years and costs $25,000. The pump will generate an incremental $20,000 in the first year. However, the revenue will decrease by $2500 per year in each of the next four years. Operating costs will be $4000 in the first year but will increase $500 per year in each of the following four years. a) Calculate BFIT net cash flow each year for this investment. Draw the cash flow diagram