1495% is the change from 40 to 638
Calculation steps:
[( 638 - 40 ) ÷ 40] x 100 = 1495%
Formula
Percentage change = [(638 - 40) / 40] x 100
Subtract the new number by the original number
638 - 40 = 598
598 ÷ 40 = 14.95
14.95 x 100 = 1495%
Example