If you divide the APR (annual percentage rate) for a credit card account by the number of billing cycles per year (usually 12), the result is known as the periodic rate. Consider the following example: Suppose that your credit card has an APR of 9%. Assuming that there are 12 billing cycles per year, the periodic rate would be % per month. Expressed as a decimal, the periodic rate is. To compute the monthly finance charge for a credit card account, you must first calculate the average daily balance, which is the sum of the outstanding balances owed each day divided by the number of days in the billing period. The average daily balance has been assumed in the following example. Use the assumed average daily balance together with the periodic rate from part A to calculate the finance charge for the month of December. Suppose that for the month of December your average daily balance has been computed to be $600. Now use the periodic rate from part A to calculate the finance charge