Mathematics only

Carpenter kakoma has a small carpentry shop in his basement to make bookcases. He makes two sizes, large and small. His profit on a large bookcase is k80, and his profit on a small bookcase is k50. It takes Emilio 6 hours to make a large bookcase and 2 hours to make a small one. He can spend only 24 hours each week on his carpentry work. He must make at least two of each size each week. What is the maximum weekly profit?

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Question:A ship is 200 m away from the base of a lighthouse. The angle of elevation from the ship to the top of the lighthouse is 30 Find the height of the lighthouse.