-75.45% is the change from 330 to 81
Calculation steps:
[( 81 - 330 ) ÷ 330] x 100 = -75.45%
Formula
Percentage change = [(81 - 330) / 330] x 100
Subtract the new number by the original number
81 - 330 = -249
-249 ÷ 330 = -0.7545454545454545
-0.7545454545454545 x 100 = -75.45%