-28.25% is the change from 892 to 640
Calculation steps:
[( 640 - 892 ) ÷ 892] x 100 = -28.25%
Formula
Percentage change = [(640 - 892) / 892] x 100
Subtract the new number by the original number
640 - 892 = -252
-252 ÷ 892 = -0.2825112107623318
-0.2825112107623318 x 100 = -28.25%