7.14% is the change from 280 to 300
Calculation steps:
[( 300 - 280 ) ÷ 280] x 100 = 7.14%
Formula
Percentage change = [(300 - 280) / 280] x 100
Subtract the new number by the original number
300 - 280 = 20
20 ÷ 280 = 0.07142857142857142
0.07142857142857142 x 100 = 7.14%