In 2015, the median family income in the United States was $66,650. If the 90th percentile for the 2015 median four-person family income was $178,500 find the percentage of families whose 2015 income was

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American households earned a median income of $57,652 in 2017, up from $55,322 in 2016, the survey reports. That number has increased a solid 12 percent since 2009, in the midst of the financial crisis, when the median household income sat at just $51,425