If the cost of a long distance phone call is C taka for the first minute and $(2/3)$ C taka for each additional three minute, What is the cost in taka of a ten minute call of this type?

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সঠিক উত্তর: 3C। ব্যাখ্যা:

If the cost of a long distance phone call is C taka for the first minute and \((2/3)\) C taka for each additional three minute, What is the cost in taka of a ten minute call of this type?