-98.75% is the change from 321 to 4
Calculation steps:
[( 4 - 321 ) ÷ 321] x 100 = -98.75%
Formula
Percentage change = [(4 - 321) / 321] x 100
Subtract the new number by the original number
4 - 321 = -317
-317 ÷ 321 = -0.9875389408099688
-0.9875389408099688 x 100 = -98.75%