-32.31% is the change from 975 to 660
Calculation steps:
[( 660 - 975 ) ÷ 975] x 100 = -32.31%
Formula
Percentage change = [(660 - 975) / 975] x 100
Subtract the new number by the original number
660 - 975 = -315
-315 ÷ 975 = -0.3230769230769231
-0.3230769230769231 x 100 = -32.31%