9.68% is the change from 310 to 340
Calculation steps:
[( 340 - 310 ) ÷ 310] x 100 = 9.68%
Formula
Percentage change = [(340 - 310) / 310] x 100
Subtract the new number by the original number
340 - 310 = 30
30 ÷ 310 = 0.0967741935483871
0.0967741935483871 x 100 = 9.68%