A consumer charges a $46.92 purchase on a credit card. The card has a daily interest rate of 0.039%. If the consumer pays off the balance at the end of 30 days, how much in interest will be paid for the purchase?

Convert the daily rate of 0.039% to a decimal: 0.00039. Over 30 days, the interest is $46.92 × 0.00039 × 30 = $0.548964, which rounds to $0.55. The correct choice is $0.55.

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