To solve this problem you must apply the proccedure shown below:
1. You have that Desiree wants to order 200 shirts that cost $5 and she has $350 in her savings.
2. Keeping this on mind, the total cost of the shirts is:
[tex]Total cost=(200)(5) \\ Totalcost=1000 dollars
[/tex]
3. Then, she must raise:
[tex]x=1000-350 \\ x=650 dollars[/tex]
Therefore, the answer is: [tex]650 dollars[/tex]