8. A tube with three openings has three different cross-sectional areas (A1:A2:A3 = 2:1:3), as shown in the figure. The pressure difference is 25 Pa between A1 and A2. If v1 = 0.125 (m/s), find the density of the fluid (kg/m3 ). (A) 561 (B) 982 (C) 1067 (D) 1534 (E) 1698