Percent of profit ( Pp ) based on the cost:
[tex]Pp=\frac{profit}{\cos t}\cdot100[/tex]where the profit in our case equals:
[tex]\text{profit}=$1150$-550=600[/tex]and the cost equals $550.
Thus...
[tex]Pp=\frac{600}{550}\cdot100[/tex][tex]Pp=109.09[/tex]Answer: 109.09%