11% is the change from 309 to 343
Calculation steps:
[( 343 - 309 ) ÷ 309] x 100 = 11%
Formula
Percentage change = [(343 - 309) / 309] x 100
Subtract the new number by the original number
343 - 309 = 34
34 ÷ 309 = 0.11003236245954692
0.11003236245954692 x 100 = 11%