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Pipes A, B and C can fill a tank in 15, 30 and 40 hours, respectively. Pipes A, B and C are opened at 6 a.m., 8 a.m. and 10 a.m., respectively, on the same day. When will the tank be full?

Three successive discounts of 40%, 25% and 20%, respectively, on the marked price of a chair, are equal to a single discount of Rs.960. The marked price (in Rs) of the chair is: