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A U-tube manometer measures the pressure difference between two pipes, A and B, carrying fluid P. The U-tube contains mercury (Fluid Q). Calculate the difference in pressure if h = 15 m, hz = 0.75 m, and hi = 0.5 m. The liquid at A and B (Fluid P) is water with a density of 1000 kg/m³, and the specific gravity of mercury is 13.6.