Please solve using excel functions!

6 For equipment that has a first cost of $10,000 and the estimated operating costs and year-end salvage values shown, (a) determine the economic service life at i=10% per year using factors, and (b) write the PMT function to determine AW for year 4 , if net operating costs are entered into cells B2 through B6. 6 For equipment that has a first cost of $10,000 and the estimated operating costs and year-end salvage values shown, (a) determine the economic service life at i=10% per year using factors, and (b) write the PMT function to determine AW for year 4 , if net operating costs are entered into cells B2 through B6