-71.81% is the change from 830 to 234
Calculation steps:
[( 234 - 830 ) ÷ 830] x 100 = -71.81%
Formula
Percentage change = [(234 - 830) / 830] x 100
Subtract the new number by the original number
234 - 830 = -596
-596 ÷ 830 = -0.7180722891566265
-0.7180722891566265 x 100 = -71.81%