30.21% is the change from 331 to 431
Calculation steps:
[( 431 - 331 ) ÷ 331] x 100 = 30.21%
Formula
Percentage change = [(431 - 331) / 331] x 100
Subtract the new number by the original number
431 - 331 = 100
100 ÷ 331 = 0.3021148036253776
0.3021148036253776 x 100 = 30.21%