-50.18% is the change from 550 to 274
Calculation steps:
[( 274 - 550 ) ÷ 550] x 100 = -50.18%
Formula
Percentage change = [(274 - 550) / 550] x 100
Subtract the new number by the original number
274 - 550 = -276
-276 ÷ 550 = -0.5018181818181818
-0.5018181818181818 x 100 = -50.18%