30.02% is the change from 423 to 550
Calculation steps:
[( 550 - 423 ) ÷ 423] x 100 = 30.02%
Formula
Percentage change = [(550 - 423) / 423] x 100
Subtract the new number by the original number
550 - 423 = 127
127 ÷ 423 = 0.30023640661938533
0.30023640661938533 x 100 = 30.02%