check your local classifieds; check with a dealer who takes trade-ins. Check with an on-line site such as Craigslist or the auction sites for completed sales.
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 really want a mower to last long, Brand is not important. A industrial quality mower is far better. The kind used by Cities, parks, and landscape companies. Industrial grade mowers far outlast "homeowner grade" mowers. They are costly though. ...