-9.33% is the change from 857 to 777
Calculation steps:
[( 777 - 857 ) ÷ 857] x 100 = -9.33%
Formula
Percentage change = [(777 - 857) / 857] x 100
Subtract the new number by the original number
777 - 857 = -80
-80 ÷ 857 = -0.09334889148191365
-0.09334889148191365 x 100 = -9.33%