-81.45% is the change from 830 to 154
Calculation steps:
[( 154 - 830 ) ÷ 830] x 100 = -81.45%
Formula
Percentage change = [(154 - 830) / 830] x 100
Subtract the new number by the original number
154 - 830 = -676
-676 ÷ 830 = -0.8144578313253013
-0.8144578313253013 x 100 = -81.45%