Xia Co. currently buys a component part for $8 per unit. Xia believes that making the part would require $4.20 per unit of direct materials and $1.10 per unit of direct labor. Xia allocates overhead using a predetermined overhead rate of 215% of direct labor cost. Xia estimates an incremental overhead rate of $0.70 per unit to make the part.

1-a.What are the relevant costs for Xia to make or buy the part?(Round your answers to 2 decimal places.)

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1-b.Should Xia make or buy the part?