2250% is the change from 40 to 940
Calculation steps:
[( 940 - 40 ) ÷ 40] x 100 = 2250%
Formula
Percentage change = [(940 - 40) / 40] x 100
Subtract the new number by the original number
940 - 40 = 900
900 ÷ 40 = 22.5
22.5 x 100 = 2250%
Example