42.37% is the change from 321 to 457
Calculation steps:
[( 457 - 321 ) ÷ 321] x 100 = 42.37%
Formula
Percentage change = [(457 - 321) / 321] x 100
Subtract the new number by the original number
457 - 321 = 136
136 ÷ 321 = 0.4236760124610592
0.4236760124610592 x 100 = 42.37%