I rented a warehouse to stack 3 tons of goods, and the monthly rent was 7,000 yuan. These goods were originally planned to be sold for 3 months, but due to the lower price, they were sold out in two months. Since the warehouse rent was saved for one month, the settlement was more expensive than The original plan earned 1,000 yuan more, please do the math, how much is the reduction per kilogram of goods?
租用仓库堆放3吨货物，每月租金7000元，这些货物原计划销售3个月，由于降低了价格，结果两个月就销售完了，由于节省了一个月的仓库租金，所以结算下来，反而比原计划多赚了1000元，请你算一算，每千克货物降低多少钱？
<gadget id="calculator">7_000 - 1_000</gadget>
<output>6_000</output>

<gadget id="calculator">3 * 1_000</gadget>
<output>3_000</output>

<gadget id="calculator">6_000 / 3_000</gadget>
<output>2</output>

<result>2</result>