-8.73% is the change from 550 to 502
Calculation steps:
[( 502 - 550 ) ÷ 550] x 100 = -8.73%
Formula
Percentage change = [(502 - 550) / 550] x 100
Subtract the new number by the original number
502 - 550 = -48
-48 ÷ 550 = -0.08727272727272728
-0.08727272727272728 x 100 = -8.73%