Answer:
Supplier's quotation (5,000 x $18) 90,000
Less: Relevant costs:
Variable costs (5,000 x $16) 80,000
Avoidable fixed cost (5,000 x $3) 15,000 95,000
Loss (5,000)
Explanation:
Trucket should buy the widgets because the relevant cost of in-house production is higher than the cost of buying from outside.