-26.61% is the change from 872 to 640
Calculation steps:
[( 640 - 872 ) ÷ 872] x 100 = -26.61%
Formula
Percentage change = [(640 - 872) / 872] x 100
Subtract the new number by the original number
640 - 872 = -232
-232 ÷ 872 = -0.26605504587155965
-0.26605504587155965 x 100 = -26.61%