3440% is the change from 15 to 531
Calculation steps:
[( 531 - 15 ) ÷ 15] x 100 = 3440%
Formula
Percentage change = [(531 - 15) / 15] x 100
Subtract the new number by the original number
531 - 15 = 516
516 ÷ 15 = 34.4
34.4 x 100 = 3440%
Example