-79.55% is the change from 396 to 81
Calculation steps:
[( 81 - 396 ) ÷ 396] x 100 = -79.55%
Formula
Percentage change = [(81 - 396) / 396] x 100
Subtract the new number by the original number
81 - 396 = -315
-315 ÷ 396 = -0.7954545454545454
-0.7954545454545454 x 100 = -79.55%