7. (15) One way to measure the flow rate of large gas pipeline is by injecting a relatively small amount of trace component. In one test, 50kg/minCO2 was injected to a methane (natural gas) pipeline. At somewhere downstream where CO2 is considered to mixed perfectly into methane, the CO2 concentration was analyzed to be 2.05%. Calculate the methane flow rate when assuming methane contained no CO2 originally. To double check the accuracy of the analysis, the upstream methane was analyzed and found to contain 0.80%CO2. What should be the correct methane flowrate? ( P4.1.9)