A garment factory produces 840 suits in 7 days. According to this calculation, how many suits are produced in a month? (A month is calculated as 30 days)
一个服装厂7天生产西服840套，照这样计算，一个月生产西服多少套？(一个月按30天计算)
<gadget id="calculator">840 / 7</gadget>
<output>120</output>

<gadget id="calculator">120 * 30</gadget>
<output>3_600</output>

<result>3_600</result>