-81.69% is the change from 830 to 152
Calculation steps:
[( 152 - 830 ) ÷ 830] x 100 = -81.69%
Formula
Percentage change = [(152 - 830) / 830] x 100
Subtract the new number by the original number
152 - 830 = -678
-678 ÷ 830 = -0.8168674698795181
-0.8168674698795181 x 100 = -81.69%