-99.88% is the change from 835 to 1
Calculation steps:
[( 1 - 835 ) ÷ 835] x 100 = -99.88%
Formula
Percentage change = [(1 - 835) / 835] x 100
Subtract the new number by the original number
1 - 835 = -834
-834 ÷ 835 = -0.9988023952095808
-0.9988023952095808 x 100 = -99.88%