-50% is the change from 554 to 277
Calculation steps:
[( 277 - 554 ) ÷ 554] x 100 = -50%
Formula
Percentage change = [(277 - 554) / 554] x 100
Subtract the new number by the original number
277 - 554 = -277
-277 ÷ 554 = -0.5
-0.5 x 100 = -50%
Example