Your total interest should not be exceeded $5400 even though there are 360 days annually. If you've to pay your interest yearly, your initial year's interest is $5400 only. It doesn't matter with how many days that you really want to allocate, or how you're going to spread it over a year. The fact is the total amount of interest is 5.4% of $100,000. Don't misinterpret the payment term yourself. Calculations may be differ, and it really depends on how the payment terms are defined.
2011-07-14 11:34:53 補充:
Garlic, if the bank said the actual interest rate is 5.4%, the borrowing interest should not be more than $5400 for the first year. It couldn't be more unless there are hidden terms in the contract, but it's illegal!