-11% is the change from 618 to 550
Calculation steps:
[( 550 - 618 ) ÷ 618] x 100 = -11%
Formula
Percentage change = [(550 - 618) / 618] x 100
Subtract the new number by the original number
550 - 618 = -68
-68 ÷ 618 = -0.11003236245954692
-0.11003236245954692 x 100 = -11%