-13.75% is the change from 960 to 828
Calculation steps:
[( 828 - 960 ) ÷ 960] x 100 = -13.75%
Formula
Percentage change = [(828 - 960) / 960] x 100
Subtract the new number by the original number
828 - 960 = -132
-132 ÷ 960 = -0.1375
-0.1375 x 100 = -13.75%