1. 21 Price Wdollars per CD u o Diole 10 20 30 20 50 60 70 80 Quantity (CD per year) B. The percentage change in price is the change in price, -$4, divided by the average price, $14, multiplied by 100 or ($4/$14) x 100, which is -28.6 percent. In 2009, the percentage change in the quantity demanded is the change in quantity, 10, divided by the average quantity, 15, multiplied by 100 or (10/15) x 100, which is 66.7 percent. So in 2009 the price elasticity of demand is -66.7%/28.6% or -2.33. In 2010, the percentage change in the quantity demanded in the change in quantity, 20, divided by the average quantity, 20, multiplied by 100 or (20/20) x 100, which is 100 percent. So in 2010 the price elasticity of demand is -100%/28.6% or-3.50. These calculations 2010