"when total revenue increases from $18,000 to $26,000 when quantity increases from eight to ten, marginal revenue is equal to"

Calculation of Marginal Revenue:

Marginal Revenue can be calculated using the following formula:

Marginal Revenue = Change in Revenue/ Change in Quantity

It is given that total revenue increases from $18,000 to $26,000 when quantity increases from eight to ten. It means change in Revenue is (26000-18000) = $8,000  and Change in Quantity is (10-8) = 2

Hence,  Marginal Revenue =8000/2 = $4,000

Hence the marginal revenue is $4,000

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