A tank initially holds 80 gal of a brine solution containing 1/8 lb of salt per gallon. At 1:0, another brine solution containing 1 lb of salt per gallon of solution is poured into the tank at the rate of 4 gal/min, while well-stirred mixture leaves the tank at the rate of 8 gal/min. Find the concentration of the solution at t-10 min. 2 decimal places (no units)

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