-57.83% is the change from 830 to 350
Calculation steps:
[( 350 - 830 ) ÷ 830] x 100 = -57.83%
Formula
Percentage change = [(350 - 830) / 830] x 100
Subtract the new number by the original number
350 - 830 = -480
-480 ÷ 830 = -0.5783132530120482
-0.5783132530120482 x 100 = -57.83%