-74.93% is the change from 339 to 85
Calculation steps:
[( 85 - 339 ) ÷ 339] x 100 = -74.93%
Formula
Percentage change = [(85 - 339) / 339] x 100
Subtract the new number by the original number
85 - 339 = -254
-254 ÷ 339 = -0.7492625368731564
-0.7492625368731564 x 100 = -74.93%