-79.12% is the change from 388 to 81
Calculation steps:
[( 81 - 388 ) ÷ 388] x 100 = -79.12%
Formula
Percentage change = [(81 - 388) / 388] x 100
Subtract the new number by the original number
81 - 388 = -307
-307 ÷ 388 = -0.7912371134020618
-0.7912371134020618 x 100 = -79.12%