450% is the change from 12 to 66
Calculation steps:
[( 66 - 12 ) ÷ 12] x 100 = 450%
Formula
Percentage change = [(66 - 12) / 12] x 100
Subtract the new number by the original number
66 - 12 = 54
54 ÷ 12 = 4.5
4.5 x 100 = 450%
Example