-17.27% is the change from 550 to 455
Calculation steps:
[( 455 - 550 ) ÷ 550] x 100 = -17.27%
Formula
Percentage change = [(455 - 550) / 550] x 100
Subtract the new number by the original number
455 - 550 = -95
-95 ÷ 550 = -0.17272727272727273
-0.17272727272727273 x 100 = -17.27%