drawer is 50 cm long, 30 cm wide, and 10 cm high. How many square decimeters of boards are needed to make two such drawers?
一个抽屉长50厘米，宽30厘米，高10厘米．做两个这样的抽屉，至少需要木板多少平方分米？
<gadget id="calculator">50 * 30</gadget>
<output>1_500</output>

<gadget id="calculator">50 * 10</gadget>
<output>500</output>

<gadget id="calculator">30 * 10</gadget>
<output>300</output>

<gadget id="calculator">500 + 300</gadget>
<output>800</output>

<gadget id="calculator">800 * 2</gadget>
<output>1_600</output>

<gadget id="calculator">1_500 + 1_600</gadget>
<output>3_100</output>

<gadget id="calculator">3_100 / 100</gadget>
<output>31</output>

<result>31</result>