Listed below are a company's monthly unit costs to manufacture and market a particular product. The company

must decide to continue making the product or buy it from an outside supplier. The supplier has offered to make the

product at the same level of quality that the company can make it$.$ Fixed marketing costs would be unaffected, but

variable marketing costs would be reduced by $30\%$ if the company were to accept the proposal. What is the maximum

amount per unit that the company can pay the supplier without decreasing operating income?

A$)$ $$8\mathrm{.}50$

B$)$ $$6\mathrm{.}75$

C$)$ $$7\mathrm{.}75$

D$)$ $$5\mathrm{.}25$