3133.33% is the change from 12 to 388
Calculation steps:
[( 388 - 12 ) ÷ 12] x 100 = 3133.33%
Formula
Percentage change = [(388 - 12) / 12] x 100
Subtract the new number by the original number
388 - 12 = 376
376 ÷ 12 = 31.333333333333332
31.333333333333332 x 100 = 3133.33%