帮我解释一下照片上的问题---3. 某种化工原料进货价为每千克30元, 物价部门规定其销售价不得高于70元, 也不得低于每千克30元. 市场发现, 单价为每千克70元时, 日销售60千克, 单价每降价1元, 日均多售出2千克. 如果日均获利2450元, 求销售单价. (1) 若每件降价x元, 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I cannot directly extract the content from the image provided. However, I can extract the text content based on your description and the visible parts of the image. Here is the extracted content in the requested format: **Question Stem:** 3. 某种化工原料进货价为每千克30元, 物价部门规定其销售价不得高于70元, 也不得低于每千克30元. 市场发现, 单价为每千克70元时, 日销售60千克, 单价每降价1元, 日均多售出2千克. 如果日均获利2450元, 求销售单价. **(1) 若每件降价x元, 可得方程:** **(2) 若设每件销售单价为x元, 可得方程:**