-82.24% is the change from 321 to 57
Calculation steps:
[( 57 - 321 ) ÷ 321] x 100 = -82.24%
Formula
Percentage change = [(57 - 321) / 321] x 100
Subtract the new number by the original number
57 - 321 = -264
-264 ÷ 321 = -0.822429906542056
-0.822429906542056 x 100 = -82.24%