Answer:
The correct option is C) $1600 cost increase.
Explanation:
COST OF BUYING WOULD BE = 4000 UNITS X $8
= $32,000
COST FOR MANUFACTURING THE PART WOULD BE =
4000 UNITS X $9 - 4000 UNITS X $.60
here we are subtracting the fixed cost from the total cost of manufacturing,a s only the variable cost would be taken in to account.
= $36,000 - $2400
= $33,600
So the difference between making product and buying product is $1600, therefore there would be increase of cost by $1600.