There is a triangular lawn in the middle of the road, with a base of 12.5 meters and a height of 8.4 meters. If the price per square meter of lawn is 12 yuan, how much does it cost to plant this lawn?
在公路中间有一块三角形草坪，底12.5米，高8.4米，如果每平方米草坪的价格是12元，种这块草坪需要多少钱？
<gadget id="calculator">8.4 / 2</gadget>
<output>4.2</output>

<gadget id="calculator">12.5 * 4.2 * 12</gadget>
<output>630</output>

<result>630</result>