Fill in the letter of the word that best fits in each sentence. Use each letter only once. 
Definitions:
Total Revenue
Total Revenue refers to the total receipts from sales of goods or services.
Economic Profit
The profit a business makes after deducting both its explicit and implicit costs, including opportunity costs.
Normal Rate of Return
The standard profit or return that is anticipated on an investment, considering the levels of risk and market conditions.
Computer Software Industry
The sector involved in the development, maintenance, and publication of software that offers different types of services or functions for computer users.
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