During a production adjustment, a sample-prep vat has 200 liters of solution at 32% active ingredient. First, 50 liters are removed and replaced with pure water; the mixture is thoroughly mixed. Then, 50 liters are removed and replaced with a solution that is 8% active ingredient; the mixture is thoroughly mixed. Then, 50 liters are removed and replaced with pure water; the mixture is thoroughly mixed. Finally, 50 liters are removed and replaced with a solution that is 8% active ingredient; the mixture is thoroughly mixed. What is the final active ingredient concentration?