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Based on the various costs of making the parts and the cost of simply buying it, Motor Company should accept Valve Company's offer because .B. it would be $10,000 cheaper to buy the part.
The cost of making the part can be found as:
= Direct materials + Direct labor + Variable manufacturing cost +Avoidable fixed manufacturing cost + Annual rental cost
= 20,000 + 55,000 + 45,000 + 40,000 + 15,000
= $175,000
The cost of buying would be:
= (10,000 x 16.50)
= $165,000
The difference is:
= 175,000 - 165,000
= $10,000
It would therefore be cheaper by $10,000 to buy.
In conclusion, option B is correct.
Find out more on decisions to buy or make at https://brainly.com/question/17130562.