-24.88% is the change from 852 to 640
Calculation steps:
[( 640 - 852 ) ÷ 852] x 100 = -24.88%
Formula
Percentage change = [(640 - 852) / 852] x 100
Subtract the new number by the original number
640 - 852 = -212
-212 ÷ 852 = -0.24882629107981222
-0.24882629107981222 x 100 = -24.88%