-30.21% is the change from 960 to 670
Calculation steps:
[( 670 - 960 ) ÷ 960] x 100 = -30.21%
Formula
Percentage change = [(670 - 960) / 960] x 100
Subtract the new number by the original number
670 - 960 = -290
-290 ÷ 960 = -0.3020833333333333
-0.3020833333333333 x 100 = -30.21%