Frank Co. is currently operating at 80% of capacity and is currently purchasing a part used in

its manufacturing operations for $25 unit. The unit cost for Frank Co. to make the part is $30,

which includes $3 of allocated common fixed costs. If 20,000 units of the part are normally

purchased each year but could be manufactured using unused capacity, what would be the

amount of incremental cost increase or decrease for making the part rather than purchasing

it?