-84.22% is the change from 830 to 131
Calculation steps:
[( 131 - 830 ) ÷ 830] x 100 = -84.22%
Formula
Percentage change = [(131 - 830) / 830] x 100
Subtract the new number by the original number
131 - 830 = -699
-699 ÷ 830 = -0.8421686746987952
-0.8421686746987952 x 100 = -84.22%