Solve the Applications of First-Order Differential Equation. Show the given, required & solution and compute with at lea

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Solve the Applications of First-Order Differential Equation. Show the given, required & solution and compute with at least 4 significant figures. Please use indefinite integral when solving (if needed)
A tank contains 800 liters of brine in which 50 kg of salt are dissolved. A pipe fills the tank with salt solution at the rate of 20 liters per minute containing 0.4 kg of dissolved salt per liter. The solution is kept uniform by stirring. A drainpipe removes the mixture from the tank at the rate of 15 liters per minute. Determine the percentage of the salt in the mixture at the end of 20 minutes.