-50% is the change from 274 to 137
Calculation steps:
[( 137 - 274 ) ÷ 274] x 100 = -50%
Formula
Percentage change = [(137 - 274) / 274] x 100
Subtract the new number by the original number
137 - 274 = -137
-137 ÷ 274 = -0.5
-0.5 x 100 = -50%
Example