At point A where the suction pipe leading to a pump is 2.50 meters below the pump an open manometer indicates a vacuum of 9 in. of mercury. The pipe is 125 mm in diameter, the discharge is 35 liters per second of oil (sp. gr. = 0.80). Compute the total head at point A with respect to a datum at the pump.

At point A where the suction pipe leading to a pump is 2.50 meters below the pump an open manometer indicates a vacuum of 9 in. of mercury. The pipe is 125 mm in diameter, the discharge is 35 liters per second of oil (sp. gr. = 0.80). Compute the total head at point A with respect to a datum at the pump.