-27.35% is the change from 830 to 603
Calculation steps:
[( 603 - 830 ) ÷ 830] x 100 = -27.35%
Formula
Percentage change = [(603 - 830) / 830] x 100
Subtract the new number by the original number
603 - 830 = -227
-227 ÷ 830 = -0.27349397590361446
-0.27349397590361446 x 100 = -27.35%