-In 2010, Consumers in Dexter Consumed Only Books and Pens

$\begin{array}{|l|l|l|l|l|}\hline &2010&&2011\\\hline \text { Item } & \text { Quantity } & \text { Price } & \text { Quantity } & \text { Price } \\\hline \text { Books } & 10 & \$ 30 & 8 & \$ 50 \\\hline \text { Pens } & 20 & \$ 1 & 15 & \$ 2 \\\hline\end{array}$
-In 2010, consumers in Dexter consumed only books and pens. The prices and quantities for 2010 and 2011 are listed in the table above. The reference base period for Dexter?s CPI is 2010. What is the CPI in 2010?

A) 1.00
B) 320
C) 100
D) 3.20