33.01% is the change from 309 to 411
Calculation steps:
[( 411 - 309 ) ÷ 309] x 100 = 33.01%
Formula
Percentage change = [(411 - 309) / 309] x 100
Subtract the new number by the original number
411 - 309 = 102
102 ÷ 309 = 0.3300970873786408
0.3300970873786408 x 100 = 33.01%