3233.33% is the change from 15 to 500
Calculation steps:
[( 500 - 15 ) ÷ 15] x 100 = 3233.33%
Formula
Percentage change = [(500 - 15) / 15] x 100
Subtract the new number by the original number
500 - 15 = 485
485 ÷ 15 = 32.333333333333336
32.333333333333336 x 100 = 3233.33%