28.57% is the change from 42 to 54
Calculation steps:
[( 54 - 42 ) ÷ 42] x 100 = 28.57%
Formula
Percentage change = [(54 - 42) / 42] x 100
Subtract the new number by the original number
54 - 42 = 12
12 ÷ 42 = 0.2857142857142857
0.2857142857142857 x 100 = 28.57%