-27.47% is the change from 830 to 602
Calculation steps:
[( 602 - 830 ) ÷ 830] x 100 = -27.47%
Formula
Percentage change = [(602 - 830) / 830] x 100
Subtract the new number by the original number
602 - 830 = -228
-228 ÷ 830 = -0.2746987951807229
-0.2746987951807229 x 100 = -27.47%