353.33% is the change from 15 to 68
Calculation steps:
[( 68 - 15 ) ÷ 15] x 100 = 353.33%
Formula
Percentage change = [(68 - 15) / 15] x 100
Subtract the new number by the original number
68 - 15 = 53
53 ÷ 15 = 3.533333333333333
3.533333333333333 x 100 = 353.33%