-94.87% is the change from 819 to 42
Calculation steps:
[( 42 - 819 ) ÷ 819] x 100 = -94.87%
Formula
Percentage change = [(42 - 819) / 819] x 100
Subtract the new number by the original number
42 - 819 = -777
-777 ÷ 819 = -0.9487179487179487
-0.9487179487179487 x 100 = -94.87%