-39.58% is the change from 960 to 580
Calculation steps:
[( 580 - 960 ) ÷ 960] x 100 = -39.58%
Formula
Percentage change = [(580 - 960) / 960] x 100
Subtract the new number by the original number
580 - 960 = -380
-380 ÷ 960 = -0.3958333333333333
-0.3958333333333333 x 100 = -39.58%