The unit price of eggs is 7.6 yuan per kilogram. Mom bought 2.5 kilograms and paid the salesperson 20 yuan. How much should I get back?
鸡蛋的单价是每千克7.6元，妈妈买了2.5千克，付给售货员20元，应找回多少钱？
<gadget id="calculator">7.6 * 2.5</gadget>
<output>19</output>

<gadget id="calculator">20 - 19</gadget>
<output>1</output>

<result>1</result>