Suppose the own price elasticity of market demand for retail gasoline is 0.9, the Rothschild index is

Question:

Suppose the own price elasticity of market demand for retail gasoline is –0.9, the Rothschild index is 0.6, and a typical gasoline retailer enjoys sales of $1.2 million annually. What is the price elasticity of demand for a representative gasoline retailer’s product?