Suppose that the price of a movie ticket increases from $7 to $23 and quantity demanded changes from 13 to 7. (Use the mid point formula) (indicate whether the changes are positive or negative) a. What is the percent change in quantity demanded for movie tickets? % b. What is the percent change in price for movie tickets? % c. When the price changes from $7 to $ 23, what is the price elasticity of demand for movie tickets? Enter a negative number and keep 2 decimals)