-10.5% is the change from 857 to 767
Calculation steps:
[( 767 - 857 ) ÷ 857] x 100 = -10.5%
Formula
Percentage change = [(767 - 857) / 857] x 100
Subtract the new number by the original number
767 - 857 = -90
-90 ÷ 857 = -0.10501750291715285
-0.10501750291715285 x 100 = -10.5%