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The wish to follow reliable sources is a good motive. The 41.3% number was not in any of those sources. Here are what the sources say: USA Today Money – 65%, Yahoo Finance – ""some 50%"", Independent Journal Review – ""57.32% drop"", Wall Street Journal – ""down around 50%"", CBS San Francisco – ""more than 50 percent"", San Jose Mercury News – 52 percent, Market Watch – ""more than half"", Forbes – ""During Fiorina’s tenure HP’s stock price collapsed from $36.58 to $18.68"". So we can try and summarize these numbers with a vague approximation or we can tell the reader all the numbers that appear to be reliably published.   "