1990% is the change from 20 to 418
Calculation steps:
[( 418 - 20 ) ÷ 20] x 100 = 1990%
Formula
Percentage change = [(418 - 20) / 20] x 100
Subtract the new number by the original number
418 - 20 = 398
398 ÷ 20 = 19.9
19.9 x 100 = 1990%
Example