【单选题】If at a price of $10, quantity bought will be 5400 per day, and at $15, quantity bought will be 4600 per day, then the price elasticity of demand is approximately:
【单选题】If at a price of $10, quantity bought will be 5400 per day, and at $15, quantity bought will be 4600 per day, then the price elasticity of demand is approximately: