-77.23% is the change from 830 to 189
Calculation steps:
[( 189 - 830 ) ÷ 830] x 100 = -77.23%
Formula
Percentage change = [(189 - 830) / 830] x 100
Subtract the new number by the original number
189 - 830 = -641
-641 ÷ 830 = -0.772289156626506
-0.772289156626506 x 100 = -77.23%