323.75% is the change from 80 to 339
Calculation steps:
[( 339 - 80 ) ÷ 80] x 100 = 323.75%
Formula
Percentage change = [(339 - 80) / 80] x 100
Subtract the new number by the original number
339 - 80 = 259
259 ÷ 80 = 3.2375
3.2375 x 100 = 323.75%
Example