-82.55% is the change from 321 to 56
Calculation steps:
[( 56 - 321 ) ÷ 321] x 100 = -82.55%
Formula
Percentage change = [(56 - 321) / 321] x 100
Subtract the new number by the original number
56 - 321 = -265
-265 ÷ 321 = -0.8255451713395638
-0.8255451713395638 x 100 = -82.55%