-8.05% is the change from 857 to 788
Calculation steps:
[( 788 - 857 ) ÷ 857] x 100 = -8.05%
Formula
Percentage change = [(788 - 857) / 857] x 100
Subtract the new number by the original number
788 - 857 = -69
-69 ÷ 857 = -0.08051341890315053
-0.08051341890315053 x 100 = -8.05%