-8.57% is the change from 420 to 384
Calculation steps:
[( 384 - 420 ) ÷ 420] x 100 = -8.57%
Formula
Percentage change = [(384 - 420) / 420] x 100
Subtract the new number by the original number
384 - 420 = -36
-36 ÷ 420 = -0.08571428571428572
-0.08571428571428572 x 100 = -8.57%