258.33% is the change from 12 to 43
Calculation steps:
[( 43 - 12 ) ÷ 12] x 100 = 258.33%
Formula
Percentage change = [(43 - 12) / 12] x 100
Subtract the new number by the original number
43 - 12 = 31
31 ÷ 12 = 2.5833333333333335
2.5833333333333335 x 100 = 258.33%