Aunt Li spent 100 yuan to buy vegetables, bought 2.5 kilograms of meat, 28 yuan per kilogram of meat, and 2.5 kilograms of tomatoes left 22 yuan, how much is per kilogram of tomatoes?
李阿姨用100元买菜，买了2.5千克肉，每千克肉28元，又买了2.5千克西红柿后剩下22元，每千克西红柿多少元？
<gadget id="calculator">2.5 * 28</gadget>
<output>70</output>

<gadget id="calculator">100 - 70 - 22</gadget>
<output>8</output>

<gadget id="calculator">8 / 2.5</gadget>
<output>3.2</output>

<result>3.2</result>