-48.81% is the change from 420 to 215
Calculation steps:
[( 215 - 420 ) ÷ 420] x 100 = -48.81%
Formula
Percentage change = [(215 - 420) / 420] x 100
Subtract the new number by the original number
215 - 420 = -205
-205 ÷ 420 = -0.4880952380952381
-0.4880952380952381 x 100 = -48.81%