-13.39% is the change from 635 to 550
Calculation steps:
[( 550 - 635 ) ÷ 635] x 100 = -13.39%
Formula
Percentage change = [(550 - 635) / 635] x 100
Subtract the new number by the original number
550 - 635 = -85
-85 ÷ 635 = -0.13385826771653545
-0.13385826771653545 x 100 = -13.39%