The length of a kind of rectangular parallelepiped ventilation chimney is 2 meters, and the cross section is rectangle, and length is 15 centimeters, and width is 10 centimeters, how many square meters of iron sheets are needed at least to make 10 such chimneys?
一种长方体通风烟囱的长为2米，横截面为长方形，长15厘米、宽10厘米，做10节这样的烟囱至少需多少平方米的铁皮？
<gadget id="calculator">2 * 100 * 15</gadget>
<output>3_000</output>

<gadget id="calculator">2 * 100 * 10</gadget>
<output>2_000</output>

<gadget id="calculator">3_000 + 2_000</gadget>
<output>5_000</output>

<gadget id="calculator">10 / 10_000</gadget>
<output>1/1_000 = around 0.001</output>

<gadget id="calculator">5_000 * 2 * (1/1_000)</gadget>
<output>10</output>

<result>10</result>