Percentages: The most useful statistics ever invented

Percentage change between a and b = [(b – a)/a]100. Example ... During the past two years, median household income for families living in the Midwest went from $44,531 to $43,622. In the first quarter of 2003 the average number of unemployed American workers was 8,399,000. In the second quarter of 2003 this figure was 9,047,000. ................
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