15.32% is the change from 555 to 640
Calculation steps:
[( 640 - 555 ) ÷ 555] x 100 = 15.32%
Formula
Percentage change = [(640 - 555) / 555] x 100
Subtract the new number by the original number
640 - 555 = 85
85 ÷ 555 = 0.15315315315315314
0.15315315315315314 x 100 = 15.32%