-98.33% is the change from 420 to 7
Calculation steps:
[( 7 - 420 ) ÷ 420] x 100 = -98.33%
Formula
Percentage change = [(7 - 420) / 420] x 100
Subtract the new number by the original number
7 - 420 = -413
-413 ÷ 420 = -0.9833333333333333
-0.9833333333333333 x 100 = -98.33%