-79.6% is the change from 397 to 81
Calculation steps:
[( 81 - 397 ) ÷ 397] x 100 = -79.6%
Formula
Percentage change = [(81 - 397) / 397] x 100
Subtract the new number by the original number
81 - 397 = -316
-316 ÷ 397 = -0.7959697732997482
-0.7959697732997482 x 100 = -79.6%