18.92% is the change from 555 to 660
Calculation steps:
[( 660 - 555 ) ÷ 555] x 100 = 18.92%
Formula
Percentage change = [(660 - 555) / 555] x 100
Subtract the new number by the original number
660 - 555 = 105
105 ÷ 555 = 0.1891891891891892
0.1891891891891892 x 100 = 18.92%