C(q)=3q2+800C(q) = 3q^2 + 800C(q)=3q2+800; P=280−4qP = 280 - 4qP=280−4q. Find the price elasticity of demand at the profit-maximizing price.
−4.5-4.5−4.5
−3.5-3.5−3.5
−2.5-2.5−2.5
−1.5-1.5−1.5
