37.19% is the change from 320 to 439
Calculation steps:
[( 439 - 320 ) ÷ 320] x 100 = 37.19%
Formula
Percentage change = [(439 - 320) / 320] x 100
Subtract the new number by the original number
439 - 320 = 119
119 ÷ 320 = 0.371875
0.371875 x 100 = 37.19%