12.46% is the change from 305 to 343
Calculation steps:
[( 343 - 305 ) ÷ 305] x 100 = 12.46%
Formula
Percentage change = [(343 - 305) / 305] x 100
Subtract the new number by the original number
343 - 305 = 38
38 ÷ 305 = 0.12459016393442623
0.12459016393442623 x 100 = 12.46%