math

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calculate the average daily balance from the following(30-day billing cycle)

7-21 billing date previous balance $400
7-28 payment $40 credit
7-31 charge $60
8-6 payment $10 credit
8-13 cash advance $50

  • math -

    On 7-21 the balance is $400.
    It remains $400 for 7 days
    On 7-28 the balance becomes $360
    It remains $360 for 3 days.
    On 7-31 the balance becomes $420
    It remains $420 for 6 days
    On 8-6, the balance becomes $410
    It remains $410 for 7 days
    On 8-13 the balance becomes $460
    It it remains $460 until the end of the billing cycle (for 7 days)
    Average balance =
    [400*7 + 360*3 + 420*6 +410*7 +460*7]/30
    = $416.33

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