3500% is the change from 15 to 540
Calculation steps:
[( 540 - 15 ) ÷ 15] x 100 = 3500%
Formula
Percentage change = [(540 - 15) / 15] x 100
Subtract the new number by the original number
540 - 15 = 525
525 ÷ 15 = 35
35 x 100 = 3500%
Example