-8.33% is the change from 960 to 880
Calculation steps:
[( 880 - 960 ) ÷ 960] x 100 = -8.33%
Formula
Percentage change = [(880 - 960) / 960] x 100
Subtract the new number by the original number
880 - 960 = -80
-80 ÷ 960 = -0.08333333333333333
-0.08333333333333333 x 100 = -8.33%