Angeline, a bright college student finds out that the iPhone 8 was just launched this past week in Cupertino, CA. She along with the thousands of consumers plans on purchasing the iPhone 8 from Best Buy due to a price decrease from $899.99 to $649.99. Apple expects to see the quantity demanded for iPhone 8 to rise from 2 million to 3 million by the end of the year. What is the iPhone 8's elasticity of demand?