The 20th percentile is an estimate of the value in which 20% of the observations should fall below this value and 80% should be above it. Methods vary on the calculations, but all methods will give similar results if there are a large number of values. See: http://en.wikipedia.org/wiki/Percentile
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The Median
Sales rank is a quantitative variable. The underlying value is sales, obviously a quantitative value. The median, minimum, maximum and percentile values are all quantitative statistics based on the ranking of data.
It is quantitative.
percentile
qualitative