295.06% is the change from 81 to 320
Calculation steps:
[( 320 - 81 ) ÷ 81] x 100 = 295.06%
Formula
Percentage change = [(320 - 81) / 81] x 100
Subtract the new number by the original number
320 - 81 = 239
239 ÷ 81 = 2.950617283950617
2.950617283950617 x 100 = 295.06%