There is a trapezoidal vegetable field, the upper base is 5 meters, the lower base is 8 meters, and the height is 6.4 meters. To grow tomatoes in this vegetable field, plant 8 kilograms of tomatoes per square meter, how many kilograms of tomatoes can this vegetable field harvest?
有一块梯形菜地，上底是5米，下底是8米，高是6.4米．要在这个菜地种西红柿，每平方米种8千克西红柿，这块菜地可以收西红柿多少千克？
<gadget id="calculator">5 + 8</gadget>
<output>13</output>

<gadget id="calculator">6.4 / 2</gadget>
<output>3.2</output>

<gadget id="calculator">13 * 3.2</gadget>
<output>41.6</output>

<gadget id="calculator">41.6 * 8</gadget>
<output>332.8</output>

<result>332.8</result>