Answer
Percentage change between two numbers A & B can be calculated as:(B-A)/A * 100
For example, if a stock price increases in value from $123 to $145 the percentage increase is:
(145-123)/123 * 100 = 22/123 * 100 = 0.179*100 = 17.9%
Alternatively, if a stock price decreases in value from $145 to $123 the percentage decrease is:
(123-145)/145 * 100 = -22/145 * 100 = -0.152*100 = -15.2%
Read more: http://wiki.answers.com/Q/How_do_you_calculate_a_percentage_change_from_one_number_to_another#ixzz165bJ0o4O
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