1.When the price of airfare from San Francisco to Hawaii changes from $560 to $610, the number of tickets demanded changes from 650 to 620 per month.

a.What is the value of the price elasticity of demand (remember to use the midpoint formula)?Show your work!

|(620-650)/[(620+650)/2]/($610-$560)/[($610+$560/2)]| =

|[(-30)/(635)]/[($50)/($585)]| =

-0.04724/0.08547=

$-0.55

Course hero is saying the answer is positive 0.55 but I'm getting negative.