-30.53% is the change from 950 to 660
Calculation steps:
[( 660 - 950 ) ÷ 950] x 100 = -30.53%
Formula
Percentage change = [(660 - 950) / 950] x 100
Subtract the new number by the original number
660 - 950 = -290
-290 ÷ 950 = -0.30526315789473685
-0.30526315789473685 x 100 = -30.53%