-99.07% is the change from 321 to 3
Calculation steps:
[( 3 - 321 ) ÷ 321] x 100 = -99.07%
Formula
Percentage change = [(3 - 321) / 321] x 100
Subtract the new number by the original number
3 - 321 = -318
-318 ÷ 321 = -0.9906542056074766
-0.9906542056074766 x 100 = -99.07%