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...
well electic mowers of corse, are easier to use and requer little to no maintence, no oil, gas, or needing to greese and fittings. though, with an electric mower, you do have to worry about the electric cord and you cant let your grass get to long or...
Go with a Toro SR4. It has a cast aluminum deck and a self propel system that is second to none. Another good brand is Snapper. There are a lot of Snapper mowers out, and they are well loved by their owners. http://www.toro.com