38.59% is the change from 311 to 431
Calculation steps:
[( 431 - 311 ) ÷ 311] x 100 = 38.59%
Formula
Percentage change = [(431 - 311) / 311] x 100
Subtract the new number by the original number
431 - 311 = 120
120 ÷ 311 = 0.3858520900321543
0.3858520900321543 x 100 = 38.59%