A parallelogram plate has a base of 15 meters and a height of 8 meters. If this steel plate weighs 35 kilograms per square meter, how much does this steel plate weigh?
一块平行四边形的钢板，底是15米，高是8米．如果这种钢板每平方米重35千克，这块钢板重多少千克？
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">35 * 120</gadget>
<output>4_200</output>

<result>4_200</result>