When 200,000 gallons of water are applied per acre, 4 tons are harvested by each acre of linguini trees yearly, but cutting back to 160,000 gallons causes the crop per acre to reduce to 2 tons yearly. Then water elasticity of linguini production is as: (w) 3.0. (x) 1.5. (y) -1.5. (z) -3.0.
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