3600% is the change from 15 to 555
Calculation steps:
[( 555 - 15 ) ÷ 15] x 100 = 3600%
Formula
Percentage change = [(555 - 15) / 15] x 100
Subtract the new number by the original number
555 - 15 = 540
540 ÷ 15 = 36
36 x 100 = 3600%
Example