What was the percentage change in the simple average

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What was the percentage change in the simple average profit per car sold by dealer X from 2000 to 2009?

1) The total profit from car sales at dealer X increased by 70% from 2000 to 2009
2) The total number of cars increased from 1253 in 2000 to 1687 in 2009

[spoiler]OA=C[/spoiler]

Source: GMAT Prep
Source: — Data Sufficiency |