A swimming pool is 50 meters long, 40 meters wide and 1.5 meters deep. Put a layer of cement on the bottom and four walls of the pool. If 4.5 kilograms of cement is used per square meter, how many kilograms of cement are needed in total? (Reminder: There are only 5 surfaces for plastering cement)
一个游泳池，长50米，宽40米，平均深1.5米．在池底和四壁抹上一层水泥，如果每平方米用水泥4.5千克，共需要水泥多少千克？(温馨提醒：抹水泥的面只有5个面)
<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">50 * 1.5</gadget>
<output>75</output>

<gadget id="calculator">40 * 1.5</gadget>
<output>60</output>

<gadget id="calculator">75 + 60</gadget>
<output>135</output>

<gadget id="calculator">135 * 2</gadget>
<output>270</output>

<gadget id="calculator">2_000 + 270</gadget>
<output>2_270</output>

<gadget id="calculator">2_270 * 4.5</gadget>
<output>10_215</output>

<result>10_215</result>