2070% is the change from 40 to 868
Calculation steps:
[( 868 - 40 ) ÷ 40] x 100 = 2070%
Formula
Percentage change = [(868 - 40) / 40] x 100
Subtract the new number by the original number
868 - 40 = 828
828 ÷ 40 = 20.7
20.7 x 100 = 2070%
Example