Sophia is planning a birthday party and needs to buy decorations. She buys balloons that cost $2 each, streamers that cost $1.50 each, and party hats that cost $3 each. If she buys 10 balloons, 8 streamers, and 5 party hats, what is the total cost of the decorations? Let's think step by step and output the final answer within \boxed{}.
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