-38% is the change from 550 to 341
Calculation steps:
[( 341 - 550 ) ÷ 550] x 100 = -38%
Formula
Percentage change = [(341 - 550) / 550] x 100
Subtract the new number by the original number
341 - 550 = -209
-209 ÷ 550 = -0.38
-0.38 x 100 = -38%
Example