-26.94% is the change from 876 to 640
Calculation steps:
[( 640 - 876 ) ÷ 876] x 100 = -26.94%
Formula
Percentage change = [(640 - 876) / 876] x 100
Subtract the new number by the original number
640 - 876 = -236
-236 ÷ 876 = -0.2694063926940639
-0.2694063926940639 x 100 = -26.94%