Daily Puzzle - February 21

When James was nine years old he hammered a nail into a tree to
mark his height. Ten years later, James returned to see how much
higher the nail was. If the tree grew by four inches each year,
how much higher would the nail be?

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Source: BrainBashers Daily Puzzle (http://www.brainbashers.com)
Brain teasers, puzzles, games and optical illusions for everyone.

[Southern_Belle]

A tree doesn't extend from the trunk of the tree right? It extends at the branches ... so it would be at the same height.