-18.95% is the change from 950 to 770
Calculation steps:
[( 770 - 950 ) ÷ 950] x 100 = -18.95%
Formula
Percentage change = [(770 - 950) / 950] x 100
Subtract the new number by the original number
770 - 950 = -180
-180 ÷ 950 = -0.18947368421052632
-0.18947368421052632 x 100 = -18.95%