-30% is the change from 950 to 665
Calculation steps:
[( 665 - 950 ) ÷ 950] x 100 = -30%
Formula
Percentage change = [(665 - 950) / 950] x 100
Subtract the new number by the original number
665 - 950 = -285
-285 ÷ 950 = -0.3
-0.3 x 100 = -30%
Example