-69.09% is the change from 550 to 170
Calculation steps:
[( 170 - 550 ) ÷ 550] x 100 = -69.09%
Formula
Percentage change = [(170 - 550) / 550] x 100
Subtract the new number by the original number
170 - 550 = -380
-380 ÷ 550 = -0.6909090909090909
-0.6909090909090909 x 100 = -69.09%