-27.83% is the change from 830 to 599
Calculation steps:
[( 599 - 830 ) ÷ 830] x 100 = -27.83%
Formula
Percentage change = [(599 - 830) / 830] x 100
Subtract the new number by the original number
599 - 830 = -231
-231 ÷ 830 = -0.2783132530120482
-0.2783132530120482 x 100 = -27.83%