The salesperson aunt said: "I sold 36 sets of greeting cards today, each with 12 cards, and the price is 15 yuan." Please help the salesperson aunt to calculate how much the greeting cards sold today?
售货员阿姨说："我今天卖出36套贺卡，每套12张，售价15元．"请你帮售货员阿姨算算今天贺卡卖了多少钱？
<gadget id="calculator">36 * 15</gadget>
<output>540</output>

<result>540</result>