-57.14% is the change from 420 to 180
Calculation steps:
[( 180 - 420 ) ÷ 420] x 100 = -57.14%
Formula
Percentage change = [(180 - 420) / 420] x 100
Subtract the new number by the original number
180 - 420 = -240
-240 ÷ 420 = -0.5714285714285714
-0.5714285714285714 x 100 = -57.14%