2550% is the change from 12 to 318
Calculation steps:
[( 318 - 12 ) ÷ 12] x 100 = 2550%
Formula
Percentage change = [(318 - 12) / 12] x 100
Subtract the new number by the original number
318 - 12 = 306
306 ÷ 12 = 25.5
25.5 x 100 = 2550%
Example