-9.01% is the change from 855 to 778
Calculation steps:
[( 778 - 855 ) ÷ 855] x 100 = -9.01%
Formula
Percentage change = [(778 - 855) / 855] x 100
Subtract the new number by the original number
778 - 855 = -77
-77 ÷ 855 = -0.09005847953216374
-0.09005847953216374 x 100 = -9.01%