3900% is the change from 13 to 520
Calculation steps:
[( 520 - 13 ) ÷ 13] x 100 = 3900%
Formula
Percentage change = [(520 - 13) / 13] x 100
Subtract the new number by the original number
520 - 13 = 507
507 ÷ 13 = 39
39 x 100 = 3900%
Example