A shaped steel plate has an upper base of 30 cm, a lower base of 70 cm, and a height of 40 cm. The steel plate weighs 5 kg per square centimeter. How many kilograms does this steel plate weigh?
一块形钢板，上底30厘米，下底70厘米，高40厘米，每平方厘米钢板重5千克，这块钢板重多少千克？
<gadget id="calculator">30 + 70</gadget>
<output>100</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">100 * 20 * 5</gadget>
<output>10_000</output>

<result>10_000</result>