2025% is the change from 40 to 850
Calculation steps:
[( 850 - 40 ) ÷ 40] x 100 = 2025%
Formula
Percentage change = [(850 - 40) / 40] x 100
Subtract the new number by the original number
850 - 40 = 810
810 ÷ 40 = 20.25
20.25 x 100 = 2025%
Example