In a trapezoidal vegetable field, the upper base is 12 meters, which is 1.5 times that of the lower base, and the height is 2 meters higher than the lower base. How many square meters is this vegetable plot?
一块梯形菜地，上底是12米，是下底的1.5倍，高比下底多2米，这块菜地有多少平方米？
<gadget id="calculator">12 * 1.5</gadget>
<output>18</output>

<gadget id="calculator">12 + 18</gadget>
<output>30</output>

<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<result>300</result>