What you know about TR (Total Revenue )
MR (Marginal Revenue)
Ar ( Average Revenue)

Total revenue is the total receipts a seller can obtain from selling goods or services to buyers. It can be written as P × Q, which is the price of the goods multiplied by the quantity of the sold goods. 

Average revenue: This refers to the amount of money earned per individual unit or user. The average revenue is the total revenue amount divided by the quantity.

marginal revenue : the revenue gained by producing one additional unit of a product or service.

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Zara♡

A firm's average revenue is its total revenue earned divided by the total units. A competitive firm's marginal revenue always equals its average revenue and price. This is because the price remains constant over varying levels of output.

Explanation:

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TR (time of revenge)

MR ( mister -.-)

Ar ( an rat )

authors choose a genre based on their purpose. fiction works well for teaching a lesson, as in fables. however, presenting facts and opinions in nonfiction might be a better way to present information. when authors begin to write, they think about what they want the reader to understand or experience. while fiction may be the best genre for storytelling, nonfiction may be the most clear for sharing facts, so both genres have merits.