-51.43% is the change from 420 to 204
Calculation steps:
[( 204 - 420 ) ÷ 420] x 100 = -51.43%
Formula
Percentage change = [(204 - 420) / 420] x 100
Subtract the new number by the original number
204 - 420 = -216
-216 ÷ 420 = -0.5142857142857142
-0.5142857142857142 x 100 = -51.43%