-48.15% is the change from 812 to 421
Calculation steps:
[( 421 - 812 ) ÷ 812] x 100 = -48.15%
Formula
Percentage change = [(421 - 812) / 812] x 100
Subtract the new number by the original number
421 - 812 = -391
-391 ÷ 812 = -0.4815270935960591
-0.4815270935960591 x 100 = -48.15%