1890% is the change from 20 to 398
Calculation steps:
[( 398 - 20 ) ÷ 20] x 100 = 1890%
Formula
Percentage change = [(398 - 20) / 20] x 100
Subtract the new number by the original number
398 - 20 = 378
378 ÷ 20 = 18.9
18.9 x 100 = 1890%
Example