-82.74% is the change from 423 to 73
Calculation steps:
[( 73 - 423 ) ÷ 423] x 100 = -82.74%
Formula
Percentage change = [(73 - 423) / 423] x 100
Subtract the new number by the original number
73 - 423 = -350
-350 ÷ 423 = -0.8274231678486997
-0.8274231678486997 x 100 = -82.74%