20.51% is the change from 39 to 47
Calculation steps:
[( 47 - 39 ) ÷ 39] x 100 = 20.51%
Formula
Percentage change = [(47 - 39) / 39] x 100
Subtract the new number by the original number
47 - 39 = 8
8 ÷ 39 = 0.20512820512820512
0.20512820512820512 x 100 = 20.51%