21.43% is the change from 28 to 34
Calculation steps:
[( 34 - 28 ) ÷ 28] x 100 = 21.43%
Formula
Percentage change = [(34 - 28) / 28] x 100
Subtract the new number by the original number
34 - 28 = 6
6 ÷ 28 = 0.21428571428571427
0.21428571428571427 x 100 = 21.43%