-30.23% is the change from 602 to 420
Calculation steps:
[( 420 - 602 ) ÷ 602] x 100 = -30.23%
Formula
Percentage change = [(420 - 602) / 602] x 100
Subtract the new number by the original number
420 - 602 = -182
-182 ÷ 602 = -0.3023255813953488
-0.3023255813953488 x 100 = -30.23%