A cuboid pool is 20 meters long, 10 meters wide, and 2 meters high. Put a layer of cement on the side and bottom of the pool, how many square meters is the area where the cement is applied?
一个长方体水池，长20米，宽10米，高2米．在池内的侧面和池底抹一层水泥，抹水泥的面积是多少平方米．
<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">20 * 2 * 2</gadget>
<output>80</output>

<gadget id="calculator">10 * 2 * 2</gadget>
<output>40</output>

<gadget id="calculator">200 + 80 + 40</gadget>
<output>320</output>

<result>320</result>