2800% is the change from 21 to 609
Calculation steps:
[( 609 - 21 ) ÷ 21] x 100 = 2800%
Formula
Percentage change = [(609 - 21) / 21] x 100
Subtract the new number by the original number
609 - 21 = 588
588 ÷ 21 = 28
28 x 100 = 2800%
Example