8.93% is the change from 280 to 305
Calculation steps:
[( 305 - 280 ) ÷ 280] x 100 = 8.93%
Formula
Percentage change = [(305 - 280) / 280] x 100
Subtract the new number by the original number
305 - 280 = 25
25 ÷ 280 = 0.08928571428571429
0.08928571428571429 x 100 = 8.93%