One of the trickiest aspects of setting money aside for retirement is figuring out how much to save. Some people will tell you that if you part with 10% of your salary year after year, you're good. Others will tell you that 15% to 20% of your income is more appropriate.

In the course of building your nest egg, it's important to think about replacement income -- meaning, what percentage of your salary today will you need to get by as a retiree? It's a hard number to narrow down.

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Source Fool.com