-94.88% is the change from 821 to 42
Calculation steps:
[( 42 - 821 ) ÷ 821] x 100 = -94.88%
Formula
Percentage change = [(42 - 821) / 821] x 100
Subtract the new number by the original number
42 - 821 = -779
-779 ÷ 821 = -0.9488428745432399
-0.9488428745432399 x 100 = -94.88%