Answer:
Option (a) is correct.
Explanation:
Manufacturing cost:
= Direct materials + Direct labor + Variable overhead + Fixed overhead
= $80,000 + $100,000 + $30,000 + $60,000
= $270,000
Purchase from outside:
= Fixed overhead + Purchase price
= $60,000 + (50,000 × $10)
= $60,000 + $500,000
= $560,000
Effect on income = Purchase from outside - Manufacturing cost
= $560,000 - $270,000
= $290,000
Therefore, the above calculations shows that income will decrease by $290,000.