Apply chemical fertilizers to a trapezoidal wheat field with an upper base length of 40 meters, a lower base length of 80 meters, and a height of 60 meters. Calculated by applying 2.5 tons of chemical fertilizers per hectare, how many tons of chemical fertilizers are needed in total?
给一块上底长40米，下底长80米，高60米的梯形麦田施化肥，按每公顷施化肥2.5吨计算，一共需要化肥多少吨？
<gadget id="calculator">40 + 80</gadget>
<output>120</output>

<gadget id="calculator">60 / 2 / 10_000</gadget>
<output>3/1_000 = around 0.003</output>

<gadget id="calculator">120 * (3/1_000) * 2.5</gadget>
<output>0.9</output>

<result>0.9</result>