请你做出我上传题目的讲解视频。在视觉效果上我希望更适合儿童理解学习。---(19) 学校食堂买了15箱苹果,每箱10千克,1千克苹果9元。买这些苹果一共多少元? Chart/Diagram Description: Type: Illustration/Diagram Main Elements: - A stack of boxes forming a rectangular block. - The block consists of 3 columns and 5 rows, totaling 15 boxes. - Each individual box is depicted as a cube or rectangular prism. - Each box is labeled with the text "10千克" (10 kilograms). - Each box also shows an image of two apples. - The illustration visually represents 15 boxes, each containing 10 kilograms of apples.

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