-99.52% is the change from 420 to 2
Calculation steps:
[( 2 - 420 ) ÷ 420] x 100 = -99.52%
Formula
Percentage change = [(2 - 420) / 420] x 100
Subtract the new number by the original number
2 - 420 = -418
-418 ÷ 420 = -0.9952380952380953
-0.9952380952380953 x 100 = -99.52%