307.41% is the change from 81 to 330
Calculation steps:
[( 330 - 81 ) ÷ 81] x 100 = 307.41%
Formula
Percentage change = [(330 - 81) / 81] x 100
Subtract the new number by the original number
330 - 81 = 249
249 ÷ 81 = 3.074074074074074
3.074074074074074 x 100 = 307.41%