-55.91% is the change from 728 to 321
Calculation steps:
[( 321 - 728 ) ÷ 728] x 100 = -55.91%
Formula
Percentage change = [(321 - 728) / 728] x 100
Subtract the new number by the original number
321 - 728 = -407
-407 ÷ 728 = -0.5590659340659341
-0.5590659340659341 x 100 = -55.91%