In a water flow system, the pressure gauge B is to measure the system pressure at point A. If the pressure at B is 87 kPa, estimate the pressure at A in kPa. Assume all fluids are at 20°C. Ywater 9790 N/m²; Ymercury 133,100 N/m²; Yoil = 8720 N/m². SAE 30 oil- Mercury Gage B 6 cm 5 cm 11 cm Water flow 4 cm