311.25% is the change from 80 to 329
Calculation steps:
[( 329 - 80 ) ÷ 80] x 100 = 311.25%
Formula
Percentage change = [(329 - 80) / 80] x 100
Subtract the new number by the original number
329 - 80 = 249
249 ÷ 80 = 3.1125
3.1125 x 100 = 311.25%
Example