-96.88% is the change from 321 to 10
Calculation steps:
[( 10 - 321 ) ÷ 321] x 100 = -96.88%
Formula
Percentage change = [(10 - 321) / 321] x 100
Subtract the new number by the original number
10 - 321 = -311
-311 ÷ 321 = -0.9688473520249221
-0.9688473520249221 x 100 = -96.88%