2519.05% is the change from 21 to 550
Calculation steps:
[( 550 - 21 ) ÷ 21] x 100 = 2519.05%
Formula
Percentage change = [(550 - 21) / 21] x 100
Subtract the new number by the original number
550 - 21 = 529
529 ÷ 21 = 25.19047619047619
25.19047619047619 x 100 = 2519.05%