2) Increasing returns it cost $60 per mower when making either 300 or 400 mowers, but only cost $48 per mower when making 500. Assuming she charges the same price for mowers, her returns are greater (increase) when she produces 500 compared to 300 or...
If you are really going to mow 4 acres regularly, choose the commercial mower. They are made for mowing lots of land and for many more hours of usage. They cost more but last a very very long time with regularly scheduled maintenance of engine and eq...
I would suggest calling mower repair shops that service Ferris mowers, and although they are a repair shop not a parts store, you can probably work a deal with them. They take used units and cannibalize them so you may be able to find used parts by t...