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Problem 3.
POLLUTION CONTROL Commissioners of a certain city determine that when x millions dollars are spent on controlling pollution, the percentage of pollution removed is given by

P(x) = (100 Sqrt(x))/0.04x^2 + 12

a. What expenditure results in the largest percentage of pollution removal?
Problem 4.
Compute the elasticity of demand for the given demand function D(p) and determine whether the demand is elastic, inelastic, or of unit elasticity at the indicated price p.

D(p) = -1.5p + 25; p = 12

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Demand type is evaluated.

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