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To find out how long the party was, we need to first subtract the cost of food from the total cost:
$354.29 - $200.49 = $153.80
Now, divide the remaining cost ($153.80) by the cost per hour ($30.76):
$153.80 / $30.76 ≈ 5
Therefore, the party was 5 hours long.
Answer: C. 5 hours