-80.86% is the change from 810 to 155
Calculation steps:
[( 155 - 810 ) ÷ 810] x 100 = -80.86%
Formula
Percentage change = [(155 - 810) / 810] x 100
Subtract the new number by the original number
155 - 810 = -655
-655 ÷ 810 = -0.808641975308642
-0.808641975308642 x 100 = -80.86%