420% is the change from 40 to 208
Calculation steps:
[( 208 - 40 ) ÷ 40] x 100 = 420%
Formula
Percentage change = [(208 - 40) / 40] x 100
Subtract the new number by the original number
208 - 40 = 168
168 ÷ 40 = 4.2
4.2 x 100 = 420%
Example