-69.82% is the change from 550 to 166
Calculation steps:
[( 166 - 550 ) ÷ 550] x 100 = -69.82%
Formula
Percentage change = [(166 - 550) / 550] x 100
Subtract the new number by the original number
166 - 550 = -384
-384 ÷ 550 = -0.6981818181818182
-0.6981818181818182 x 100 = -69.82%