Also, should speedy sell or process further

The unassembled bikes are sold to retailers at $400 each. Speedy currently has unused productive capacity that is expected to continue indefinitely; management has concluded that some of this capacity can be used to assemble the bikes and sell them at $440 each. Assembling the bikes will increase direct materials by $5 per bike, and direct labor by $10 per bike. Additional variable overhead will be incurred at the normal rates, but there will be no additional fixed overhead as a result of assembling the bikes. Prepare an incremental analysis for the sell-or-process-further decision