A budget airline charges each customer e I 3 euros for every leg of the flights between London and Ibiza. The only exception is that it charges e euros for the first leg of the first round-trip for the same customer. How much is the total cost of n round-trip tickets for one customer?
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A$$\frac{e+ne}{27}$$
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B$$\frac{2e+2ne}{3}$$
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C$$\frac{2e+ne}{300}$$
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D$$\frac{2n+ne}{3}$$
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E$$\frac{ne}{9}$$
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正确答案: B