-13.95% is the change from 645 to 555
Calculation steps:
[( 555 - 645 ) ÷ 645] x 100 = -13.95%
Formula
Percentage change = [(555 - 645) / 645] x 100
Subtract the new number by the original number
555 - 645 = -90
-90 ÷ 645 = -0.13953488372093023
-0.13953488372093023 x 100 = -13.95%