-19.79% is the change from 960 to 770
Calculation steps:
[( 770 - 960 ) ÷ 960] x 100 = -19.79%
Formula
Percentage change = [(770 - 960) / 960] x 100
Subtract the new number by the original number
770 - 960 = -190
-190 ÷ 960 = -0.19791666666666666
-0.19791666666666666 x 100 = -19.79%