12900% is the change from 3 to 390
Calculation steps:
[( 390 - 3 ) ÷ 3] x 100 = 12900%
Formula
Percentage change = [(390 - 3) / 3] x 100
Subtract the new number by the original number
390 - 3 = 387
387 ÷ 3 = 129
129 x 100 = 12900%
Example