-10.18% is the change from 855 to 768
Calculation steps:
[( 768 - 855 ) ÷ 855] x 100 = -10.18%
Formula
Percentage change = [(768 - 855) / 855] x 100
Subtract the new number by the original number
768 - 855 = -87
-87 ÷ 855 = -0.10175438596491228
-0.10175438596491228 x 100 = -10.18%