-18.75% is the change from 960 to 780
Calculation steps:
[( 780 - 960 ) ÷ 960] x 100 = -18.75%
Formula
Percentage change = [(780 - 960) / 960] x 100
Subtract the new number by the original number
780 - 960 = -180
-180 ÷ 960 = -0.1875
-0.1875 x 100 = -18.75%