Use the Venn diagram below to find the number of elements in the region. 
-n(A)
Definitions:
Interest
The charge for borrowing money or the return on invested capital.
Sell At Premium
Occurs when a financial instrument, such as a bond, is sold for a price higher than its face value.
Effective Interest Rate
The rate at which invested capital grows over a period, taking into consideration the effect of compounding.
Amortizing
The process of gradually writing off the initial cost of an asset over a period, especially in the context of loan repayments or in spreading the cost of intangible assets.
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