-83.3% is the change from 485 to 81
Calculation steps:
[( 81 - 485 ) ÷ 485] x 100 = -83.3%
Formula
Percentage change = [(81 - 485) / 485] x 100
Subtract the new number by the original number
81 - 485 = -404
-404 ÷ 485 = -0.8329896907216495
-0.8329896907216495 x 100 = -83.3%