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Definitely (C), similar OG Question to practice will be

https://gmatclub.com/forum/the-cost-of- ... fl=similar
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Official Explanation:



Answer: C

(A) We are not concerned with labor costs.
(B) There is no information to support this option.
(C) The fact is that the cost of producing nuclear submarines is 10% less in Atlantis than in Utopia, even with transportation and other costs included. The cost to import nuclear submarine to Utopia from Atlantis will still be cheaper. Therefore, the import related tariff is less than 10% of the cost of manufacturing in Utopia. This is expressed in option C, which is the correct answer.
(D) This doesn’t relate to the reduction in the cost.
(E) This option talks about time. We are concerned about the costs.
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Let's break down our passage:
1. cost in Atlantis 10% less than in Utopia
2. cheaper to import from Atlantis than build in Utopia, even with added costs

If the import is cheaper even with the added costs, than the added costs must be less than 10% of the production price in Utopia.
If this option appears in our answer choices, we're done! Otherwise, we'll need to examine each answer choice individually.

In fact, this is exactly answer choice (C)! No need to check the other options...

Answer: C
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