-26.8% is the change from 877 to 642
Calculation steps:
[( 642 - 877 ) ÷ 877] x 100 = -26.8%
Formula
Percentage change = [(642 - 877) / 877] x 100
Subtract the new number by the original number
642 - 877 = -235
-235 ÷ 877 = -0.26795895096921324
-0.26795895096921324 x 100 = -26.8%