Xingzhong Supermarket sells 84 bottles of mineral water on average every week, at 1.5 yuan per bottle. How much is the total income in a month (30 days) based on this calculation?
兴中超市平均每周卖出矿泉水84瓶，每瓶1.5元，照这样计算一个月(30天)共收入多少元？
<gadget id="calculator">84 / 7</gadget>
<output>12</output>

<gadget id="calculator">12 * 30 * 1.5</gadget>
<output>540</output>

<result>540</result>