The question does not provide enough information to calculate the average daily balance or finance charge. The exact amount of savings in finance charges or the missing entries in Gino's debit card register cannot be determined without specific information.
To determine the average daily balance for the 30-day period, we need to know the balance for each day. Unfortunately, the question does not provide specific information on the daily balances. Therefore, it is not possible to calculate the average daily balance or the finance charge.
For part f, to calculate how much Irina can save in finance charges by making the down payment on the last day compared to the first day, we need to have the specific finance charges associated with each scenario. Without that information, it is not possible to determine the exact amount of savings.
For part g, there is no information provided about Gino's debit card register or the missing entries.