-76.9% is the change from 420 to 97
Calculation steps:
[( 97 - 420 ) ÷ 420] x 100 = -76.9%
Formula
Percentage change = [(97 - 420) / 420] x 100
Subtract the new number by the original number
97 - 420 = -323
-323 ÷ 420 = -0.7690476190476191
-0.7690476190476191 x 100 = -76.9%