3213.33% is the change from 15 to 497
Calculation steps:
[( 497 - 15 ) ÷ 15] x 100 = 3213.33%
Formula
Percentage change = [(497 - 15) / 15] x 100
Subtract the new number by the original number
497 - 15 = 482
482 ÷ 15 = 32.13333333333333
32.13333333333333 x 100 = 3213.33%