Consider the following tree diagram: 
What is the height of the subtree with root R?
Definitions:
Merchandise Inventory
The goods available for sale to customers in retail or wholesale businesses, valued at lower of cost or market value on the balance sheet.
Credit Sales
Transactions where goods or services are provided to a customer with an agreement to pay at a later date.
Operating Expenses
Expenses related to the normal operations of a business, excluding the cost of goods sold.
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