2523.81% is the change from 21 to 551
Calculation steps:
[( 551 - 21 ) ÷ 21] x 100 = 2523.81%
Formula
Percentage change = [(551 - 21) / 21] x 100
Subtract the new number by the original number
551 - 21 = 530
530 ÷ 21 = 25.238095238095237
25.238095238095237 x 100 = 2523.81%