12.75% is the change from 306 to 345
Calculation steps:
[( 345 - 306 ) ÷ 306] x 100 = 12.75%
Formula
Percentage change = [(345 - 306) / 306] x 100
Subtract the new number by the original number
345 - 306 = 39
39 ÷ 306 = 0.12745098039215685
0.12745098039215685 x 100 = 12.75%