Liz Weston: 9 money numbers you need to know

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Liz Weston: 9 money numbers you need to know

FILE - This undated file photo provided by NerdWallet shows Liz Weston, a columnist for personal finance website NerdWallet.com. (NerdWallet via AP, File)

Liz Weston: 9 money numbers you need to know

FILE - This undated file photo provided by NerdWallet shows Liz Weston, a columnist for personal finance website NerdWallet.com. (NerdWallet via AP, File)