-2.33% is the change from 430 to 420
Calculation steps:
[( 420 - 430 ) ÷ 430] x 100 = -2.33%
Formula
Percentage change = [(420 - 430) / 430] x 100
Subtract the new number by the original number
420 - 430 = -10
-10 ÷ 430 = -0.023255813953488372
-0.023255813953488372 x 100 = -2.33%