33.66% is the change from 306 to 409
Calculation steps:
[( 409 - 306 ) ÷ 306] x 100 = 33.66%
Formula
Percentage change = [(409 - 306) / 306] x 100
Subtract the new number by the original number
409 - 306 = 103
103 ÷ 306 = 0.3366013071895425
0.3366013071895425 x 100 = 33.66%