-26.86% is the change from 875 to 640
Calculation steps:
[( 640 - 875 ) ÷ 875] x 100 = -26.86%
Formula
Percentage change = [(640 - 875) / 875] x 100
Subtract the new number by the original number
640 - 875 = -235
-235 ÷ 875 = -0.26857142857142857
-0.26857142857142857 x 100 = -26.86%