Suppose the demand for a product is given by D(p)=−3p+139.. A) Calculate the elasticity of demand…

Suppose the demand for a product is given by
D(p)=−3p+139..

A) Calculate the elasticity of demand at a price of $31.
Elasticity = ? (Round to three decimal places.)
B) At what price do you have unit elasticity? (Round your answer
to the nearest penny.)
Price = ?