-12.63% is the change from 950 to 830
Calculation steps:
[( 830 - 950 ) ÷ 950] x 100 = -12.63%
Formula
Percentage change = [(830 - 950) / 950] x 100
Subtract the new number by the original number
830 - 950 = -120
-120 ÷ 950 = -0.12631578947368421
-0.12631578947368421 x 100 = -12.63%