Lay a parallelogram lawn with a base of 30m and a height of 25m. If the lawn costs 45 yuan per square meter, how much is the total cost?
铺一块底是30m，高是25m的平行四边形草坪．如果每平方米草坪需要45元，那么共需要多少元？
<gadget id="calculator">30 * 25</gadget>
<output>750</output>

<gadget id="calculator">750 * 45</gadget>
<output>33_750</output>

<result>33_750</result>