2900% is the change from 13 to 390
Calculation steps:
[( 390 - 13 ) ÷ 13] x 100 = 2900%
Formula
Percentage change = [(390 - 13) / 13] x 100
Subtract the new number by the original number
390 - 13 = 377
377 ÷ 13 = 29
29 x 100 = 2900%
Example