13.07% is the change from 306 to 346
Calculation steps:
[( 346 - 306 ) ÷ 306] x 100 = 13.07%
Formula
Percentage change = [(346 - 306) / 306] x 100
Subtract the new number by the original number
346 - 306 = 40
40 ÷ 306 = 0.13071895424836602
0.13071895424836602 x 100 = 13.07%