In a trapezoidal wheat field, the upper base is 100 meters long, the lower base is 250 meters long, and the height is 120 meters. If 0.15 kg of chemical fertilizer is applied per square meter, how many kilograms of chemical fertilizer should be applied to this field?
一块梯形麦田，上底长100米，下底长250米，高是120米，如果每平方米施化肥0.15千克，这块地应施化肥多少千克？
<gadget id="calculator">100 + 250</gadget>
<output>350</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">350 * 60 * 0.15</gadget>
<output>3_150</output>

<result>3_150</result>