Workers in a plastic factory work for 4 hours in the morning and afternoon, and produce 210 plastic bags per hour. How many plastic bags are produced in one day?
某塑料厂工人上午和下午都工作4小时，每小时生产塑料袋210个，一天共生产塑料袋多少个．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">210 * 8</gadget>
<output>1_680</output>

<result>1_680</result>