An orifice meter has a gas (SG = 0.8) flowing through it. The pressures at points land 2 are P1 = 600 psig and P2 = 395 psig. The diameters at point 1 and point 2 are 9 inches and 5 inches. The discharge coefficient (Cv or Co) is 0.7. What is the volumetric flow rate through this meter in Scft/D? Assume the gas to be ideal and temperature constant at 115F.