-79.33% is the change from 387 to 80
Calculation steps:
[( 80 - 387 ) ÷ 387] x 100 = -79.33%
Formula
Percentage change = [(80 - 387) / 387] x 100
Subtract the new number by the original number
80 - 387 = -307
-307 ÷ 387 = -0.7932816537467701
-0.7932816537467701 x 100 = -79.33%