7.14% is the change from 28 to 30
Calculation steps:
[( 30 - 28 ) ÷ 28] x 100 = 7.14%
Formula
Percentage change = [(30 - 28) / 28] x 100
Subtract the new number by the original number
30 - 28 = 2
2 ÷ 28 = 0.07142857142857142
0.07142857142857142 x 100 = 7.14%