Answer
$B\cap (M\cup W)$
2.3 million
Work Step by Step
From the table we see that the set of sales in 2010 is called $B$, and the set of sales in the West and Midwest can be written in a form $M\cup W$
Therefore the set of sales in 2010 in the West and Midwest is $B\cap (M\cup W)$
From the table we see that its cardinality is $1.1+1.2=2.3$ (million)
