Demand function D(p)=100-p at p=20 What is price elasticity?

Can someone tell me how to find the price elasticity of that function?

Answer 1

E = (∂Q/∂P) (P/Q) = (-1) (20/(100-20)) = -20/80 = -1/4 = -0.25

E = (∂Q/∂P) (P/Q) = (-100/10²) (10/(100/10)) = -1

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