453.33% is the change from 15 to 83
Calculation steps:
[( 83 - 15 ) ÷ 15] x 100 = 453.33%
Formula
Percentage change = [(83 - 15) / 15] x 100
Subtract the new number by the original number
83 - 15 = 68
68 ÷ 15 = 4.533333333333333
4.533333333333333 x 100 = 453.33%