A credit card company has a fraud-detection service that determines if a card has any unusual activity. The company maintains a database of daily charges on a customer's credit card. Days when the card was inactive are excluded from the database. If a day's worth of charges appears unusual, the customer is contacted to make sure that the credit card has not been compromised. Use the following daily charges (rounded to the nearest dollar) to determine the amount the daily charges must exceed before the customer is contacted.

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