46.15% is the change from 39 to 57
Calculation steps:
[( 57 - 39 ) ÷ 39] x 100 = 46.15%
Formula
Percentage change = [(57 - 39) / 39] x 100
Subtract the new number by the original number
57 - 39 = 18
18 ÷ 39 = 0.46153846153846156
0.46153846153846156 x 100 = 46.15%