-96.9% is the change from 420 to 13
Calculation steps:
[( 13 - 420 ) ÷ 420] x 100 = -96.9%
Formula
Percentage change = [(13 - 420) / 420] x 100
Subtract the new number by the original number
13 - 420 = -407
-407 ÷ 420 = -0.969047619047619
-0.969047619047619 x 100 = -96.9%