2525% is the change from 12 to 315
Calculation steps:
[( 315 - 12 ) ÷ 12] x 100 = 2525%
Formula
Percentage change = [(315 - 12) / 12] x 100
Subtract the new number by the original number
315 - 12 = 303
303 ÷ 12 = 25.25
25.25 x 100 = 2525%
Example