a certain machine uses methane as a fuel. the gas is purchased in containers holding 25 lb of methane and costing $3.20 exclusive of the container….

a certain machine uses methane as a fuel. the gas is purchased in containers holding 25 lb of methane and costing $3.20 exclusive of the container. If the machins uses 300 cu ft/d at 15 oz/sq in. gauge and 100F, what is the cost of methane per day?