-84.34% is the change from 830 to 130
Calculation steps:
[( 130 - 830 ) ÷ 830] x 100 = -84.34%
Formula
Percentage change = [(130 - 830) / 830] x 100
Subtract the new number by the original number
130 - 830 = -700
-700 ÷ 830 = -0.8433734939759037
-0.8433734939759037 x 100 = -84.34%