3273.33% is the change from 15 to 506
Calculation steps:
[( 506 - 15 ) ÷ 15] x 100 = 3273.33%
Formula
Percentage change = [(506 - 15) / 15] x 100
Subtract the new number by the original number
506 - 15 = 491
491 ÷ 15 = 32.733333333333334
32.733333333333334 x 100 = 3273.33%