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The first, second and third class third class train fare is Rs. 15, Rs. 10, and Rs. 7.50 per km respectively. Someday the ratio of numbers travelling in these categories is 2 : 5 : 13. What will be the average fare per passenger for that day?

A

Rs. 12

B

Rs. 10

C

Rs. 15

D

none of these

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