-10% is the change from 430 to 387
Calculation steps:
[( 387 - 430 ) ÷ 430] x 100 = -10%
Formula
Percentage change = [(387 - 430) / 430] x 100
Subtract the new number by the original number
387 - 430 = -43
-43 ÷ 430 = -0.1
-0.1 x 100 = -10%
Example