A trapezoidal vegetable field has an upper base of 8 meters, a lower base of 14 meters, and a height of 5 meters. What is the area of this vegetable field in square decimeters?
一块梯形的菜地，上底是8米，下底是14米，高是5米，这块菜地的面积是多少平方分米．
<gadget id="calculator">8 + 14</gadget>
<output>22</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">22 * (5/2) * 100</gadget>
<output>5_500</output>

<result>5_500</result>