12.36% is the change from 550 to 618
Calculation steps:
[( 618 - 550 ) ÷ 550] x 100 = 12.36%
Formula
Percentage change = [(618 - 550) / 550] x 100
Subtract the new number by the original number
618 - 550 = 68
68 ÷ 550 = 0.12363636363636364
0.12363636363636364 x 100 = 12.36%