31.12% is the change from 331 to 434
Calculation steps:
[( 434 - 331 ) ÷ 331] x 100 = 31.12%
Formula
Percentage change = [(434 - 331) / 331] x 100
Subtract the new number by the original number
434 - 331 = 103
103 ÷ 331 = 0.311178247734139
0.311178247734139 x 100 = 31.12%