Answer:
See below
Explanation:
Supplier's quotation (5,000 × $17)
$85,000
Less: Relevant costs
Variable cost (5,000 × $16)
$80,000
Avoidable fixed cost (5,000 × $4)
$20,000
Balance $100,000
Loss $15,000
Croquet should buy the widgets because the relevant cost of in house production is higher than the cost of buying it outside.