Tomato paste is produced in the food business. 6% dry matter in the production process computer program water is fed as raw material and the evaporator with 30% dry matter content tomato paste is grown. 10,000 kg tomato paste when the system is just started being produced. However, the amount of tomato paste in a 24-hour package is 5.400. kg (Capacity is linear). The reason for this reason in production in the intervals formed by the accumulated pollution of the little ones in the heat must. Total production total (of heat clearing) emptied, it becomes usable again and again) 5 hours to pay is suffering. 1500 TL cleaning materials for cleaning is used. Raw material price 8 TL/kg, product 50 TL/kg, production 2 TL/kg. How often should the vaporizer be cleaned for maximum profitability?