Answer
2010:$\quad [3.3\quad 21 \quad 8.7]$
2011:$\quad [4.1\quad 19.4 \quad 16.2]$
Work Step by Step
Let
$A=[2.5\quad 22.7 \quad 4.4]$
$B=[0.8\quad -1.7 \quad 4.3]$
$C=[0.8\quad -1.6 \quad 7.5]$
representing
A: millions of units sold in Q1, 2009. The entries correspond to products as given in the table.
B: change in 2010
C: change in 2011
The total sales in $2010$ = $A+B=$
$=[2.5+0.8\quad 22.7-1.7 \quad 4.4+4.3]$
$=[3.3\quad 21 \quad 8.7]$
The total sales in $2011$ = $A+B+C=$
$=[3.3+0.8\quad 21-1.6 \quad 8.7+7.5]$
$=[4.1\quad 19.4 \quad 16.2]$
