-52.65% is the change from 830 to 393
Calculation steps:
[( 393 - 830 ) ÷ 830] x 100 = -52.65%
Formula
Percentage change = [(393 - 830) / 830] x 100
Subtract the new number by the original number
393 - 830 = -437
-437 ÷ 830 = -0.5265060240963856
-0.5265060240963856 x 100 = -52.65%