30.72% is the change from 345 to 451
Calculation steps:
[( 451 - 345 ) ÷ 345] x 100 = 30.72%
Formula
Percentage change = [(451 - 345) / 345] x 100
Subtract the new number by the original number
451 - 345 = 106
106 ÷ 345 = 0.3072463768115942
0.3072463768115942 x 100 = 30.72%