-40.23% is the change from 430 to 257
Calculation steps:
[( 257 - 430 ) ÷ 430] x 100 = -40.23%
Formula
Percentage change = [(257 - 430) / 430] x 100
Subtract the new number by the original number
257 - 430 = -173
-173 ÷ 430 = -0.40232558139534885
-0.40232558139534885 x 100 = -40.23%