Lasso Corporation manufactures a variety of appliances which all use Part B$89.$ Currently,

Lasso manufactures Part B$89$ itself. It has been producing $9000$ units of Part B$89$ annually.

The annual costs of producing Part B$89$ at the level of $9000$ units include:

All of the fixed manufacturing overhead costs would continue whether Part B$89$ is made

internally or purchased from an outside supplier. Lasso has no alternative use for its

manufacturing facilities. Nadal Parts Company has offered to sell $9,000$ units of Part B$89$ to

Lassof or $$20\mathrm{.}40$ per unit. What is the highest price per unit that Lasso should be willing to

pay for the part?

A$.$ $$18\mathrm{.}70$

B$.$ $$15\mathrm{.}70$

C$.$ $$11\mathrm{.}50$

D$.$ $$7\mathrm{.}30$