-81.81% is the change from 830 to 151
Calculation steps:
[( 151 - 830 ) ÷ 830] x 100 = -81.81%
Formula
Percentage change = [(151 - 830) / 830] x 100
Subtract the new number by the original number
151 - 830 = -679
-679 ÷ 830 = -0.8180722891566266
-0.8180722891566266 x 100 = -81.81%