105.13% is the change from 39 to 80
Calculation steps:
[( 80 - 39 ) ÷ 39] x 100 = 105.13%
Formula
Percentage change = [(80 - 39) / 39] x 100
Subtract the new number by the original number
80 - 39 = 41
41 ÷ 39 = 1.0512820512820513
1.0512820512820513 x 100 = 105.13%