The Table Shows a Total-Product Schedule for a Resource

Multiple Choice

The table shows a total-product schedule for a resource. Assume that the quantities of other resources the firm employs remain constant. If the firm can sell 24 units of output at a price of $1.00 and 42 units of output at a price of $0.80, the marginal revenue product of the second unit of the resource is

A) $5.40.
B) $7.80.
C) $9.60.
D) $12.20.