-96.46% is the change from 820 to 29
Calculation steps:
[( 29 - 820 ) ÷ 820] x 100 = -96.46%
Formula
Percentage change = [(29 - 820) / 820] x 100
Subtract the new number by the original number
29 - 820 = -791
-791 ÷ 820 = -0.9646341463414634
-0.9646341463414634 x 100 = -96.46%