8.17% is the change from 306 to 331
Calculation steps:
[( 331 - 306 ) ÷ 306] x 100 = 8.17%
Formula
Percentage change = [(331 - 306) / 306] x 100
Subtract the new number by the original number
331 - 306 = 25
25 ÷ 306 = 0.08169934640522876
0.08169934640522876 x 100 = 8.17%