Based upon the following data, estimate the cost of ending inventory using the gross profit method. 
Definitions:
Rate of Return
The gain or loss of an investment over a specified period, expressed as a percentage of the investment's cost.
Return on Investment
A performance measure used to evaluate the efficiency or profitability of an investment, calculated as the net profit divided by the initial cost.
Annual Revenue
The total income generated by a business, organization, or individual within a fiscal year from its operations.
Initial Investment
The initial sum of money used to start a business project, purchase assets, or acquire starting capital.
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