-20.87% is the change from 321 to 254
Calculation steps:
[( 254 - 321 ) ÷ 321] x 100 = -20.87%
Formula
Percentage change = [(254 - 321) / 321] x 100
Subtract the new number by the original number
254 - 321 = -67
-67 ÷ 321 = -0.2087227414330218
-0.2087227414330218 x 100 = -20.87%