20.91% is the change from 330 to 399
Calculation steps:
[( 399 - 330 ) ÷ 330] x 100 = 20.91%
Formula
Percentage change = [(399 - 330) / 330] x 100
Subtract the new number by the original number
399 - 330 = 69
69 ÷ 330 = 0.20909090909090908
0.20909090909090908 x 100 = 20.91%