325% is the change from 12 to 51
Calculation steps:
[( 51 - 12 ) ÷ 12] x 100 = 325%
Formula
Percentage change = [(51 - 12) / 12] x 100
Subtract the new number by the original number
51 - 12 = 39
39 ÷ 12 = 3.25
3.25 x 100 = 325%
Example