Answer:
Increase in net annual operating income $35,000
Explanation:
$
Variable cost of internal production
(30,000+50,000 + 20,000) 100,000
Variable cost of purchase (1.25× 100,000) <u>125,000</u>
Extra variable cost of buying ( 25,000)
Add savings in fixed cost from 15,000
Add rent from facilities <u> 45,000</u>
Increase in net annual operating income <u> 35,000</u>
Increase in net annual operating income $35,000
The balance of the the fixed cost is not relevant hence it was not considered. This is so because whatever decision is taken, it would be incurred either way