-55.6% is the change from 723 to 321
Calculation steps:
[( 321 - 723 ) ÷ 723] x 100 = -55.6%
Formula
Percentage change = [(321 - 723) / 723] x 100
Subtract the new number by the original number
321 - 723 = -402
-402 ÷ 723 = -0.5560165975103735
-0.5560165975103735 x 100 = -55.6%