9.62% is the change from 312 to 342
Calculation steps:
[( 342 - 312 ) ÷ 312] x 100 = 9.62%
Formula
Percentage change = [(342 - 312) / 312] x 100
Subtract the new number by the original number
342 - 312 = 30
30 ÷ 312 = 0.09615384615384616
0.09615384615384616 x 100 = 9.62%