Skim milk ( 10% total solids(TS)) is concentrated in a two stage membrane processing system. It is concentrated to 20% TS in the 1st stage, which is the feed for the 2nd stage, where it gets concentrated to a final concentration of 30% TS. The waste stream from the 1st stage has TS of 0.5% and the recycle stream has TS of 2%. The flow rate of the final product stream is 1000 kg/h. Find the flow rate of the recycle stream.

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