-31.83% is the change from 421 to 287
Calculation steps:
[( 287 - 421 ) ÷ 421] x 100 = -31.83%
Formula
Percentage change = [(287 - 421) / 421] x 100
Subtract the new number by the original number
287 - 421 = -134
-134 ÷ 421 = -0.3182897862232779
-0.3182897862232779 x 100 = -31.83%