-97.39% is the change from 421 to 11
Calculation steps:
[( 11 - 421 ) ÷ 421] x 100 = -97.39%
Formula
Percentage change = [(11 - 421) / 421] x 100
Subtract the new number by the original number
11 - 421 = -410
-410 ÷ 421 = -0.9738717339667459
-0.9738717339667459 x 100 = -97.39%