At a gourmet nut shop, nuts are sold in bulk. Cashews sell for

per pound and macadamia nuts sell for

per pound. Lee wishes to purchase 5 pounds of mixed nuts by mixing 3.5 pounds of cashews and 1.5 pounds of macadamia nuts. What will be the price per pound of the mixture?
◦ $6.40
◦ $32.00
◦ $18.00
◦ $3.60