-18.92% is the change from 555 to 450
Calculation steps:
[( 450 - 555 ) ÷ 555] x 100 = -18.92%
Formula
Percentage change = [(450 - 555) / 555] x 100
Subtract the new number by the original number
450 - 555 = -105
-105 ÷ 555 = -0.1891891891891892
-0.1891891891891892 x 100 = -18.92%