The adjusted balance method of calculating your finance charge uses your previous balance less any payments and credits made during the billing cycle. New charges are not factored into the adjusted balance. The periodic rate is applied to the adjusted balance to calculate the finance charge.
APR = 14%
Periodic rate = 1.17%
Days in billing cycle = 30
Previous balance = $1000
Payment 16th day = $100
Charge 20th day = $50
Ending balance = $950
Adjusted balance = $900
Finance charge = Adjusted balance * periodic rate
= $900 * .0117
= $10.53

