2957.14% is the change from 21 to 642
Calculation steps:
[( 642 - 21 ) ÷ 21] x 100 = 2957.14%
Formula
Percentage change = [(642 - 21) / 21] x 100
Subtract the new number by the original number
642 - 21 = 621
621 ÷ 21 = 29.571428571428573
29.571428571428573 x 100 = 2957.14%