-73.44% is the change from 305 to 81
Calculation steps:
[( 81 - 305 ) ÷ 305] x 100 = -73.44%
Formula
Percentage change = [(81 - 305) / 305] x 100
Subtract the new number by the original number
81 - 305 = -224
-224 ÷ 305 = -0.7344262295081967
-0.7344262295081967 x 100 = -73.44%