306.17% is the change from 81 to 329
Calculation steps:
[( 329 - 81 ) ÷ 81] x 100 = 306.17%
Formula
Percentage change = [(329 - 81) / 81] x 100
Subtract the new number by the original number
329 - 81 = 248
248 ÷ 81 = 3.0617283950617282
3.0617283950617282 x 100 = 306.17%