-50.09% is the change from 555 to 277
Calculation steps:
[( 277 - 555 ) ÷ 555] x 100 = -50.09%
Formula
Percentage change = [(277 - 555) / 555] x 100
Subtract the new number by the original number
277 - 555 = -278
-278 ÷ 555 = -0.5009009009009009
-0.5009009009009009 x 100 = -50.09%