certain type of top is 85 yuan each, and the clothing store buys 2 boxes of this type of top at a time, with 20 pieces in each box. How much is the total cost?
某种上衣每件85元，服装店一次购进这种上衣2箱，每箱20件，一共用了多少元？
<gadget id="calculator">20 * 2 * 85</gadget>
<output>3_400</output>

<result>3_400</result>