3300% is the change from 12 to 408
Calculation steps:
[( 408 - 12 ) ÷ 12] x 100 = 3300%
Formula
Percentage change = [(408 - 12) / 12] x 100
Subtract the new number by the original number
408 - 12 = 396
396 ÷ 12 = 33
33 x 100 = 3300%
Example