There is a parallelogram with a base of 5 meters and a height of 4.2 meters. It cost 252 yuan to plant lawn on this land. What is the average price of lawn per square meter?
有一块平行四边形空地，底是5米，高是4.2米．在这块地上种草坪花费了252元，平均每平方米草坪的价格是多少元？
<gadget id="calculator">5 * 4.2</gadget>
<output>21</output>

<gadget id="calculator">252 / 21</gadget>
<output>12</output>

<result>12</result>