-48.21% is the change from 811 to 420
Calculation steps:
[( 420 - 811 ) ÷ 811] x 100 = -48.21%
Formula
Percentage change = [(420 - 811) / 811] x 100
Subtract the new number by the original number
420 - 811 = -391
-391 ÷ 811 = -0.48212083847102344
-0.48212083847102344 x 100 = -48.21%