The upper base of a trapezoidal vegetable field is 140m, and the lower base is 160m. The height is 50m, and the average cabbage collected per square meter is 0.48kg. How many tons of cabbage can be harvested in this vegetable field?
一块梯形菜地的上底是140m，下底是160米．高是50m，平均每平方米收白菜0.48kg，这块菜地收白菜多少吨．
<gadget id="calculator">140 + 160</gadget>
<output>300</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">0.48 / 1_000</gadget>
<output>0.00048</output>

<gadget id="calculator">300 * 25 * 0.00048</gadget>
<output>3.6</output>

<result>3.6</result>