A cylindrical overhead tank is filled by two pumps P1 and P2 can till the tank in 12 hour.There is a pipe P3 which can empty the tank in 8 hour. Both the pumps are opened simultaneously. The supervisor of the tank, before going out on a work, sets a timer to open P3 when the tank is half filled so that the tank is exactly filled up by the time he is back. Due to technical fault P3 opens when the tank is one-third filled. If the supervisor comes back as per the plan. What percentage of tank is till empty?

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