1560% is the change from 40 to 664
Calculation steps:
[( 664 - 40 ) ÷ 40] x 100 = 1560%
Formula
Percentage change = [(664 - 40) / 40] x 100
Subtract the new number by the original number
664 - 40 = 624
624 ÷ 40 = 15.6
15.6 x 100 = 1560%
Example