42.81% is the change from 320 to 457
Calculation steps:
[( 457 - 320 ) ÷ 320] x 100 = 42.81%
Formula
Percentage change = [(457 - 320) / 320] x 100
Subtract the new number by the original number
457 - 320 = 137
137 ÷ 320 = 0.428125
0.428125 x 100 = 42.81%