At a lump-sum cost of $70000, Ivanhoe Company recently purchased the following items for resale: Item No. of Items Purchased Resale Price Per Unit M 4200 $3.85 N 2100 12.20 O 6200 6.20 The appropriate cost per unit of inventory is: M N $3.61 $11.42 $5.81 $3.36 $10.64 $5.41 $3.85 $12.20 $6.20 O $5.60 $5.60 $5.60