3173.33% is the change from 15 to 491
Calculation steps:
[( 491 - 15 ) ÷ 15] x 100 = 3173.33%
Formula
Percentage change = [(491 - 15) / 15] x 100
Subtract the new number by the original number
491 - 15 = 476
476 ÷ 15 = 31.733333333333334
31.733333333333334 x 100 = 3173.33%