Last year, Richmond Company produced $8,000$ units and sold $6,000$ units of its product at a

price of $$20.$ Costs for last year are as follows:

Direct materials

Variable manufacturing overhead

Fixed manufacturing overhead

Fixed administrative expense

$$3\mathrm{.}00$ per unit

$$3\mathrm{.}80$ per unit

$$0\mathrm{.}80$ per unit

$$40,000$

$$0\mathrm{.}50$ per unit

$$4,900$

$$11,000$

Using a GAAP income statement, calculate Richmond Company's operating income last year.

$($Round your answer to two decimal places.$)$

a$.$ $$15,500$

b$.$ $$25,500$

c$.$ $$18,250$

d$.$ $$25,000$

e$.$ None of the above