-67.37% is the change from 950 to 310
Calculation steps:
[( 310 - 950 ) ÷ 950] x 100 = -67.37%
Formula
Percentage change = [(310 - 950) / 950] x 100
Subtract the new number by the original number
310 - 950 = -640
-640 ÷ 950 = -0.6736842105263158
-0.6736842105263158 x 100 = -67.37%