31.87% is the change from 342 to 451
Calculation steps:
[( 451 - 342 ) ÷ 342] x 100 = 31.87%
Formula
Percentage change = [(451 - 342) / 342] x 100
Subtract the new number by the original number
451 - 342 = 109
109 ÷ 342 = 0.31871345029239767
0.31871345029239767 x 100 = 31.87%