-83.73% is the change from 830 to 135
Calculation steps:
[( 135 - 830 ) ÷ 830] x 100 = -83.73%
Formula
Percentage change = [(135 - 830) / 830] x 100
Subtract the new number by the original number
135 - 830 = -695
-695 ÷ 830 = -0.8373493975903614
-0.8373493975903614 x 100 = -83.73%