2952.38% is the change from 21 to 641
Calculation steps:
[( 641 - 21 ) ÷ 21] x 100 = 2952.38%
Formula
Percentage change = [(641 - 21) / 21] x 100
Subtract the new number by the original number
641 - 21 = 620
620 ÷ 21 = 29.523809523809526
29.523809523809526 x 100 = 2952.38%