-78.19% is the change from 830 to 181
Calculation steps:
[( 181 - 830 ) ÷ 830] x 100 = -78.19%
Formula
Percentage change = [(181 - 830) / 830] x 100
Subtract the new number by the original number
181 - 830 = -649
-649 ÷ 830 = -0.7819277108433735
-0.7819277108433735 x 100 = -78.19%