-96.91% is the change from 421 to 13
Calculation steps:
[( 13 - 421 ) ÷ 421] x 100 = -96.91%
Formula
Percentage change = [(13 - 421) / 421] x 100
Subtract the new number by the original number
13 - 421 = -408
-408 ÷ 421 = -0.9691211401425178
-0.9691211401425178 x 100 = -96.91%