34.69% is the change from 320 to 431
Calculation steps:
[( 431 - 320 ) ÷ 320] x 100 = 34.69%
Formula
Percentage change = [(431 - 320) / 320] x 100
Subtract the new number by the original number
431 - 320 = 111
111 ÷ 320 = 0.346875
0.346875 x 100 = 34.69%