-90% is the change from 430 to 43
Calculation steps:
[( 43 - 430 ) ÷ 430] x 100 = -90%
Formula
Percentage change = [(43 - 430) / 430] x 100
Subtract the new number by the original number
43 - 430 = -387
-387 ÷ 430 = -0.9
-0.9 x 100 = -90%
Example