An orchard is trapezoidal in shape. Its upper base is 150 meters, its lower base is 200 meters, and its height is 80 meters. If each fruit tree covers an area of 10 square meters, how many fruit trees are there in this orchard?
一个果园形状是梯形．它的上底是150米，下底是200米，高是80米．如果每棵果树占地10平方米，这个果园共有果树多少棵？
<gadget id="calculator">150 + 200</gadget>
<output>350</output>

<gadget id="calculator">80 / 2 / 10</gadget>
<output>4</output>

<gadget id="calculator">350 * 4</gadget>
<output>1_400</output>

<result>1_400</result>