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.

hopefully,

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 )

select the word from the list that best fits the definition unreasonably stubborn

answer:

no sweat final showdown set

explanation:

it is just sweet