A credit card shows a balance of $0 for the first 5 days, a balance of $200 from the 6th to the 20th day, and a balance of $400 from the 21st to the 30th day of the billing cycle. What is the average daily balance for this credit card?

There are 15 days with a $200 balance and 10 days with a $400 balance; the first 5 days contribute $0. The average daily balance is (15 × $200 + 10 × $400 + 5 × $0) ÷ 30 = $233.33, so the correct choice is $233.33.

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