two pumps are being consodered for purchase. If interest is 7% which pump should be bought?

use p/a p/g f/p etc. formulas

Data Initial Cost Operating Costs /year Annual Benefits Salvage Value Useful Life Alt. X $105,000 $25,000 $170.000 $15,000 5 Years Alt Y $225,000 $55,000 $245,000 $20.000 10 Years