7.69% is the change from 39 to 42
Calculation steps:
[( 42 - 39 ) ÷ 39] x 100 = 7.69%
Formula
Percentage change = [(42 - 39) / 39] x 100
Subtract the new number by the original number
42 - 39 = 3
3 ÷ 39 = 0.07692307692307693
0.07692307692307693 x 100 = 7.69%