12.87% is the change from 303 to 342
Calculation steps:
[( 342 - 303 ) ÷ 303] x 100 = 12.87%
Formula
Percentage change = [(342 - 303) / 303] x 100
Subtract the new number by the original number
342 - 303 = 39
39 ÷ 303 = 0.12871287128712872
0.12871287128712872 x 100 = 12.87%