-94.88% is the change from 820 to 42
Calculation steps:
[( 42 - 820 ) ÷ 820] x 100 = -94.88%
Formula
Percentage change = [(42 - 820) / 820] x 100
Subtract the new number by the original number
42 - 820 = -778
-778 ÷ 820 = -0.948780487804878
-0.948780487804878 x 100 = -94.88%