A country produces only ice cream and pie. Quantities and prices of these goods for the last several years are shown below. The base year is 2008. Year Price of Ice Cream Quantity of Ice Cream Price oI'Pie Quantity of Pic 2008 $2.50 40 $5.00 20 2009 $3 .00 50 $6.00 25 2010 $4.00 40 $6.00 30 Between 2009 and 2010, real GDP grew at a rate of O A. 20% O B. 0% O C. 13.3% 0 D. 36%