2300% is the change from 21 to 504
Calculation steps:
[( 504 - 21 ) ÷ 21] x 100 = 2300%
Formula
Percentage change = [(504 - 21) / 21] x 100
Subtract the new number by the original number
504 - 21 = 483
483 ÷ 21 = 23
23 x 100 = 2300%
Example