Eileen is looking toward her financial future. "What formula do you use to know if the nest egg that you have is enough for retirement?" she asks.

The formula is simple, Suze says. Add the interest income that nest egg will generate to Social Security and any other investments. "If that's enough to pay your bills, you've got enough," Suze says. "If it's not, it's not."

Want to see if you, or your parents, are saving enough for retirement? Use this calculator.

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