-4% is the change from 400 to 384
Calculation steps:
[( 384 - 400 ) ÷ 400] x 100 = -4%
Formula
Percentage change = [(384 - 400) / 400] x 100
Subtract the new number by the original number
384 - 400 = -16
-16 ÷ 400 = -0.04
-0.04 x 100 = -4%
Example