-9.36% is the change from 855 to 775
Calculation steps:
[( 775 - 855 ) ÷ 855] x 100 = -9.36%
Formula
Percentage change = [(775 - 855) / 855] x 100
Subtract the new number by the original number
775 - 855 = -80
-80 ÷ 855 = -0.0935672514619883
-0.0935672514619883 x 100 = -9.36%