Johnson Co. is currently operating at 80% of capacity and is currently purchasing a part used in its manufacturing operations for $8.00 a unit. The unit cost for Dan Co. to make the part is $9.00, which includes $.60 of fixed costs. If 4,000 units of the part are normally purchased each year but could be manufactured using unused capacity, what would be the amount of differential cost increase or decrease for making the part rather than purchasing it?
Answer :- Differential cost increase = $1,600
Cost of buying = 4,000*$8 = $32,000
Cost of Manufacturing = 4,000 * ($9 - $0.60) = $33,600
It would be bad decision to produce the parts because they would spend $1,600 ( $33,600 - $32,000) more than if they continue to purchase them from a vendor.
So the difference between making and buying product is $1,600, therefore there would be increase of cost by $1,600.
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