425% is the change from 40 to 210
Calculation steps:
[( 210 - 40 ) ÷ 40] x 100 = 425%
Formula
Percentage change = [(210 - 40) / 40] x 100
Subtract the new number by the original number
210 - 40 = 170
170 ÷ 40 = 4.25
4.25 x 100 = 425%
Example