-80% is the change from 810 to 162
Calculation steps:
[( 162 - 810 ) ÷ 810] x 100 = -80%
Formula
Percentage change = [(162 - 810) / 810] x 100
Subtract the new number by the original number
162 - 810 = -648
-648 ÷ 810 = -0.8
-0.8 x 100 = -80%
Example