9.64% is the change from 280 to 307
Calculation steps:
[( 307 - 280 ) ÷ 280] x 100 = 9.64%
Formula
Percentage change = [(307 - 280) / 280] x 100
Subtract the new number by the original number
307 - 280 = 27
27 ÷ 280 = 0.09642857142857143
0.09642857142857143 x 100 = 9.64%