Trucking transportation rates are \(x\) dollars per metric ton per kilometer. How much does it cost, in dollars, to tran

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Trucking transportation rates are \(x\) dollars per metric ton per kilometer. How much does it cost, in dollars, to transport one dozen cars, which weigh two metric tons each, \(n\) kilometers by truck?

(A) \(\dfrac{x}{12n}\)
(B) \(\dfrac{x}{24n}\)
(C) \(\dfrac{xn}{24}\)
(D) \(12xn\)
(E) \(24xn\)

Answer: E

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Transportation rate = $x / metric ton / kilometers
1km = $x / metric tons
So for n km = $ xn / metric tons
This mean 1 metric ton = $ x n
and 2 metric tons = $ 2xn
So transportation rate for 1 car = $ 2xn
1 dozen = 12
So for 12 cars = 12 * $2xn
= $24xn


Answer = E