12.38% is the change from 307 to 345
Calculation steps:
[( 345 - 307 ) ÷ 307] x 100 = 12.38%
Formula
Percentage change = [(345 - 307) / 307] x 100
Subtract the new number by the original number
345 - 307 = 38
38 ÷ 307 = 0.1237785016286645
0.1237785016286645 x 100 = 12.38%