How do I upgrade the RAM in my 2011 MacBook Pro and how much should I pay?

Sashritha Peiris December 13, 2012
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I have a MacBook Pro late 2011 model. I would like to know how to upgrade the RAM and how much it would (should) cost.

I already have 4GB, does anyone recommend I do not need to upgrade? I am currently running Mountain Lion.

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