3233.33% is the change from 12 to 400
Calculation steps:
[( 400 - 12 ) ÷ 12] x 100 = 3233.33%
Formula
Percentage change = [(400 - 12) / 12] x 100
Subtract the new number by the original number
400 - 12 = 388
388 ÷ 12 = 32.333333333333336
32.333333333333336 x 100 = 3233.33%