-50.9% is the change from 279 to 137
Calculation steps:
[( 137 - 279 ) ÷ 279] x 100 = -50.9%
Formula
Percentage change = [(137 - 279) / 279] x 100
Subtract the new number by the original number
137 - 279 = -142
-142 ÷ 279 = -0.5089605734767025
-0.5089605734767025 x 100 = -50.9%