Microeconomics 19th Edition by Campbell McConnell,Stanley Brue,Sean Flynn

Exercise 3

Suppose that the totalrévenue received by a company selling basketballs is $600 when the price is set at $30 per basketball and $600 when the price is set at $20 per basketball. Without using the midpoint formula, can you tell whether demand is elastic, inelastic, or unit-elastic over this price range?