Economic activity initiated by market participants imposes costs on free riders

In the figure above, if real GDP is $10 trillion, aggregate planned expenditure is

A) equal to $10 trillion and there are no unplanned inventory changes. B) less than $10 trillion and unplanned inventory changes are positive. C) equal to $10 trillion and unplanned inventory changes are negative. D) more than $10 trillion and unplanned inventory changes are negative. E) equal to $10 trillion and unplanned inventory changes are positive.

Given the data in the above table, what is the marginal revenue when the 15th unit is sold?

A) $7.00 B) $5.00 C) $3.00 D) $1.00