31.29% is the change from 342 to 449
Calculation steps:
[( 449 - 342 ) ÷ 342] x 100 = 31.29%
Formula
Percentage change = [(449 - 342) / 342] x 100
Subtract the new number by the original number
449 - 342 = 107
107 ÷ 342 = 0.3128654970760234
0.3128654970760234 x 100 = 31.29%