2355% is the change from 20 to 491
Calculation steps:
[( 491 - 20 ) ÷ 20] x 100 = 2355%
Formula
Percentage change = [(491 - 20) / 20] x 100
Subtract the new number by the original number
491 - 20 = 471
471 ÷ 20 = 23.55
23.55 x 100 = 2355%
Example