102.56% is the change from 39 to 79
Calculation steps:
[( 79 - 39 ) ÷ 39] x 100 = 102.56%
Formula
Percentage change = [(79 - 39) / 39] x 100
Subtract the new number by the original number
79 - 39 = 40
40 ÷ 39 = 1.0256410256410255
1.0256410256410255 x 100 = 102.56%