29.79% is the change from 423 to 549
Calculation steps:
[( 549 - 423 ) ÷ 423] x 100 = 29.79%
Formula
Percentage change = [(549 - 423) / 423] x 100
Subtract the new number by the original number
549 - 423 = 126
126 ÷ 423 = 0.2978723404255319
0.2978723404255319 x 100 = 29.79%