-9.12% is the change from 855 to 777
Calculation steps:
[( 777 - 855 ) ÷ 855] x 100 = -9.12%
Formula
Percentage change = [(777 - 855) / 855] x 100
Subtract the new number by the original number
777 - 855 = -78
-78 ÷ 855 = -0.0912280701754386
-0.0912280701754386 x 100 = -9.12%