-78.92% is the change from 830 to 175
Calculation steps:
[( 175 - 830 ) ÷ 830] x 100 = -78.92%
Formula
Percentage change = [(175 - 830) / 830] x 100
Subtract the new number by the original number
175 - 830 = -655
-655 ÷ 830 = -0.7891566265060241
-0.7891566265060241 x 100 = -78.92%