-94.81% is the change from 810 to 42
Calculation steps:
[( 42 - 810 ) ÷ 810] x 100 = -94.81%
Formula
Percentage change = [(42 - 810) / 810] x 100
Subtract the new number by the original number
42 - 810 = -768
-768 ÷ 810 = -0.9481481481481482
-0.9481481481481482 x 100 = -94.81%