2542.86% is the change from 21 to 555
Calculation steps:
[( 555 - 21 ) ÷ 21] x 100 = 2542.86%
Formula
Percentage change = [(555 - 21) / 21] x 100
Subtract the new number by the original number
555 - 21 = 534
534 ÷ 21 = 25.428571428571427
25.428571428571427 x 100 = 2542.86%