225% is the change from 12 to 39
Calculation steps:
[( 39 - 12 ) ÷ 12] x 100 = 225%
Formula
Percentage change = [(39 - 12) / 12] x 100
Subtract the new number by the original number
39 - 12 = 27
27 ÷ 12 = 2.25
2.25 x 100 = 225%
Example