-97.82% is the change from 321 to 7
Calculation steps:
[( 7 - 321 ) ÷ 321] x 100 = -97.82%
Formula
Percentage change = [(7 - 321) / 321] x 100
Subtract the new number by the original number
7 - 321 = -314
-314 ÷ 321 = -0.9781931464174455
-0.9781931464174455 x 100 = -97.82%