-48.85% is the change from 823 to 421
Calculation steps:
[( 421 - 823 ) ÷ 823] x 100 = -48.85%
Formula
Percentage change = [(421 - 823) / 823] x 100
Subtract the new number by the original number
421 - 823 = -402
-402 ÷ 823 = -0.488456865127582
-0.488456865127582 x 100 = -48.85%