2170% is the change from 40 to 908
Calculation steps:
[( 908 - 40 ) ÷ 40] x 100 = 2170%
Formula
Percentage change = [(908 - 40) / 40] x 100
Subtract the new number by the original number
908 - 40 = 868
868 ÷ 40 = 21.7
21.7 x 100 = 2170%
Example