The average cost per hour in dollars of producing x riding lawn mowers iIs given by the 2200 C(x) = 0.8x2 + 16x - 278+ (a) Use a graphing utility to determine the number of riding lawn mowers to produce in order to minimize average cost. (b) What is the minimum average cost? (a) The average cost is minimized when approximately lawn mowers are produced per hour. (Round to the nearest whole number as needed.) (b) The minimum average cost is approximately $ (Round to the nearest cent as needed.) per mower.

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