387.5% is the change from 8 to 39
Calculation steps:
[( 39 - 8 ) ÷ 8] x 100 = 387.5%
Formula
Percentage change = [(39 - 8) / 8] x 100
Subtract the new number by the original number
39 - 8 = 31
31 ÷ 8 = 3.875
3.875 x 100 = 387.5%
Example