3386.67% is the change from 15 to 523
Calculation steps:
[( 523 - 15 ) ÷ 15] x 100 = 3386.67%
Formula
Percentage change = [(523 - 15) / 15] x 100
Subtract the new number by the original number
523 - 15 = 508
508 ÷ 15 = 33.86666666666667
33.86666666666667 x 100 = 3386.67%