-33.13% is the change from 480 to 321
Calculation steps:
[( 321 - 480 ) ÷ 480] x 100 = -33.13%
Formula
Percentage change = [(321 - 480) / 480] x 100
Subtract the new number by the original number
321 - 480 = -159
-159 ÷ 480 = -0.33125
-0.33125 x 100 = -33.13%