-83.13% is the change from 480 to 81
Calculation steps:
[( 81 - 480 ) ÷ 480] x 100 = -83.13%
Formula
Percentage change = [(81 - 480) / 480] x 100
Subtract the new number by the original number
81 - 480 = -399
-399 ÷ 480 = -0.83125
-0.83125 x 100 = -83.13%