-71.33% is the change from 279 to 80
Calculation steps:
[( 80 - 279 ) ÷ 279] x 100 = -71.33%
Formula
Percentage change = [(80 - 279) / 279] x 100
Subtract the new number by the original number
80 - 279 = -199
-199 ÷ 279 = -0.7132616487455197
-0.7132616487455197 x 100 = -71.33%