3260% is the change from 15 to 504
Calculation steps:
[( 504 - 15 ) ÷ 15] x 100 = 3260%
Formula
Percentage change = [(504 - 15) / 15] x 100
Subtract the new number by the original number
504 - 15 = 489
489 ÷ 15 = 32.6
32.6 x 100 = 3260%
Example