-86.42% is the change from 486 to 66
Calculation steps:
[( 66 - 486 ) ÷ 486] x 100 = -86.42%
Formula
Percentage change = [(66 - 486) / 486] x 100
Subtract the new number by the original number
66 - 486 = -420
-420 ÷ 486 = -0.8641975308641975
-0.8641975308641975 x 100 = -86.42%