Acylindrical tank with a radius of 2-m is filled with oil and water. the water has a density of rho = 1000 kg/m3 while the oil has a density of rho = 800 kg/m^3 . if the depth of the water is 2.5 m, and the pressure difference between the top of the oil and the bottom of the water is 80 kpa, determine the depth of the oil, in m. assume that gravity is 9.81 m/s^2 .