-19.95% is the change from 401 to 321
Calculation steps:
[( 321 - 401 ) ÷ 401] x 100 = -19.95%
Formula
Percentage change = [(321 - 401) / 401] x 100
Subtract the new number by the original number
321 - 401 = -80
-80 ÷ 401 = -0.19950124688279303
-0.19950124688279303 x 100 = -19.95%