-93.35% is the change from 421 to 28
Calculation steps:
[( 28 - 421 ) ÷ 421] x 100 = -93.35%
Formula
Percentage change = [(28 - 421) / 421] x 100
Subtract the new number by the original number
28 - 421 = -393
-393 ÷ 421 = -0.9334916864608076
-0.9334916864608076 x 100 = -93.35%