-32.38% is the change from 420 to 284
Calculation steps:
[( 284 - 420 ) ÷ 420] x 100 = -32.38%
Formula
Percentage change = [(284 - 420) / 420] x 100
Subtract the new number by the original number
284 - 420 = -136
-136 ÷ 420 = -0.3238095238095238
-0.3238095238095238 x 100 = -32.38%