-83.33% is the change from 486 to 81
Calculation steps:
[( 81 - 486 ) ÷ 486] x 100 = -83.33%
Formula
Percentage change = [(81 - 486) / 486] x 100
Subtract the new number by the original number
81 - 486 = -405
-405 ÷ 486 = -0.8333333333333334
-0.8333333333333334 x 100 = -83.33%