A U-shaped tube is open at the top at both ends. It is filled with water (light blue) and an unknown liquid (grey) on top of the water on the left side. Assume that the scales on the left and right side of the U-tube are given in cm. If the pressure at the dot (point P at 9 cm) is P1, at what height h on the left side of tube is the pressure also P1? Give your answer in cm with two decimal places