-83.57% is the change from 493 to 81
Calculation steps:
[( 81 - 493 ) ÷ 493] x 100 = -83.57%
Formula
Percentage change = [(81 - 493) / 493] x 100
Subtract the new number by the original number
81 - 493 = -412
-412 ÷ 493 = -0.8356997971602435
-0.8356997971602435 x 100 = -83.57%