To support the school outreach program, Mr. Thompson wants to raise $1000 by selling baked goods. He is selling cupcakes at $2 each, cookies at $1.50 each, and brownies at $3 each. Mr. Thompson sold 150 cupcakes, 200 cookies, and 75 brownies. How much more money does he need to raise to reach his goal? Let's think step by step and output the final answer within \boxed{}.
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