pls help asap!

Cullumber Corporation currently manufactures a subassembly for its main product. The costs per unit are as follows: Funkhouser Company has contacted Cullumber with an offer to sell it 4,500 of the subassemblies for $29 each If Cullumber buys the subassemblies, $5 of the fixed overhead per unit will be allocated to other products. Should Cullumbermake or buy the subassemblies? Cullumber should to sive $ per unit