In a mixing vat there are initially 300 litres of volatile liquid. 3 litres of fresh...

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In a mixing vat there are initially 300 litres of volatile liquid. 3 litres of fresh liquid are added per hour, but 15% of the current content of the vat is lost each hour due to evaporation. How many litres of liquid are there after 4 hours? Enter your answer symbolically, as in these examples In a mixing vat there are initially 300 litres of volatile liquid. 3 litres of fresh liquid are added per hour, but 15% of the current content of the vat is lost each hour due to evaporation. How many litres of liquid are there after 4 hours? Enter your answer symbolically, as in these examples