-48.1% is the change from 420 to 218
Calculation steps:
[( 218 - 420 ) ÷ 420] x 100 = -48.1%
Formula
Percentage change = [(218 - 420) / 420] x 100
Subtract the new number by the original number
218 - 420 = -202
-202 ÷ 420 = -0.48095238095238096
-0.48095238095238096 x 100 = -48.1%