-74.12% is the change from 313 to 81
Calculation steps:
[( 81 - 313 ) ÷ 313] x 100 = -74.12%
Formula
Percentage change = [(81 - 313) / 313] x 100
Subtract the new number by the original number
81 - 313 = -232
-232 ÷ 313 = -0.7412140575079872
-0.7412140575079872 x 100 = -74.12%