-4.22% is the change from 877 to 840
Calculation steps:
[( 840 - 877 ) ÷ 877] x 100 = -4.22%
Formula
Percentage change = [(840 - 877) / 877] x 100
Subtract the new number by the original number
840 - 877 = -37
-37 ÷ 877 = -0.04218928164196123
-0.04218928164196123 x 100 = -4.22%