The store sells 4 boxes of thermos cups, 12 in each case, with a total income of 864 yuan. How much is each thermos cup?
商店卖出4箱保温杯，每箱12个，一共收入864元，每个保温杯多少钱？
<gadget id="calculator">864 / 4 / 12</gadget>
<output>18</output>

<result>18</result>