350% is the change from 12 to 54
Calculation steps:
[( 54 - 12 ) ÷ 12] x 100 = 350%
Formula
Percentage change = [(54 - 12) / 12] x 100
Subtract the new number by the original number
54 - 12 = 42
42 ÷ 12 = 3.5
3.5 x 100 = 350%
Example