-74.14% is the change from 321 to 83
Calculation steps:
[( 83 - 321 ) ÷ 321] x 100 = -74.14%
Formula
Percentage change = [(83 - 321) / 321] x 100
Subtract the new number by the original number
83 - 321 = -238
-238 ÷ 321 = -0.7414330218068536
-0.7414330218068536 x 100 = -74.14%