64.1% is the change from 39 to 64
Calculation steps:
[( 64 - 39 ) ÷ 39] x 100 = 64.1%
Formula
Percentage change = [(64 - 39) / 39] x 100
Subtract the new number by the original number
64 - 39 = 25
25 ÷ 39 = 0.6410256410256411
0.6410256410256411 x 100 = 64.1%