-48.53% is the change from 816 to 420
Calculation steps:
[( 420 - 816 ) ÷ 816] x 100 = -48.53%
Formula
Percentage change = [(420 - 816) / 816] x 100
Subtract the new number by the original number
420 - 816 = -396
-396 ÷ 816 = -0.4852941176470588
-0.4852941176470588 x 100 = -48.53%