-66.56% is the change from 960 to 321
Calculation steps:
[( 321 - 960 ) ÷ 960] x 100 = -66.56%
Formula
Percentage change = [(321 - 960) / 960] x 100
Subtract the new number by the original number
321 - 960 = -639
-639 ÷ 960 = -0.665625
-0.665625 x 100 = -66.56%