-12.91% is the change from 550 to 479
Calculation steps:
[( 479 - 550 ) ÷ 550] x 100 = -12.91%
Formula
Percentage change = [(479 - 550) / 550] x 100
Subtract the new number by the original number
479 - 550 = -71
-71 ÷ 550 = -0.1290909090909091
-0.1290909090909091 x 100 = -12.91%