Bozemen Co. makes a credit card sale to a customer for $800. The credit card sale has a grace period of 30 days and then an interest charge of 1.8% per month is added to the balance. If the unpaid balance on the above sale is $650 at the end of the grace period the interest charge is

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The interest charge is calculated on the unpaid balance of $650 after the grace period. The interest rate is 1.8% per month, so the interest charge is $650 * 0.018 = $11.70.