2.23% is the change from 538 to 550
Calculation steps:
[( 550 - 538 ) ÷ 538] x 100 = 2.23%
Formula
Percentage change = [(550 - 538) / 538] x 100
Subtract the new number by the original number
550 - 538 = 12
12 ÷ 538 = 0.022304832713754646
0.022304832713754646 x 100 = 2.23%