Calculating annual rate of interest?

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On January 1, 2005 a person’s savings account was worth $200,000. Every month thereafter this person makes a cash contribution of $676 to the account. If the fund is expected to be worthy $400,000 on January 1, 2010, what annual rate of interest is being earned on the fund?

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I'm not sure how to approach the problem. Do I split it up by taking the initial $200k out and then using a $676 gradient, or what? If someone could please explain it, as well as post the solution, I'd greatly appreciate it.
 
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