-74.92% is the change from 319 to 80
Calculation steps:
[( 80 - 319 ) ÷ 319] x 100 = -74.92%
Formula
Percentage change = [(80 - 319) / 319] x 100
Subtract the new number by the original number
80 - 319 = -239
-239 ÷ 319 = -0.7492163009404389
-0.7492163009404389 x 100 = -74.92%