-26.04% is the change from 868 to 642
Calculation steps:
[( 642 - 868 ) ÷ 868] x 100 = -26.04%
Formula
Percentage change = [(642 - 868) / 868] x 100
Subtract the new number by the original number
642 - 868 = -226
-226 ÷ 868 = -0.26036866359447003
-0.26036866359447003 x 100 = -26.04%