2420% is the change from 20 to 504
Calculation steps:
[( 504 - 20 ) ÷ 20] x 100 = 2420%
Formula
Percentage change = [(504 - 20) / 20] x 100
Subtract the new number by the original number
504 - 20 = 484
484 ÷ 20 = 24.2
24.2 x 100 = 2420%
Example