There is an open space with a length of 45 meters and a width of 40 meters in the park. If 4 plants are planted per square meter of open space, how many plants can be planted in total?
公园里有一块长45米，宽40米的空地，如果每平方米空地上种植4棵植物，共可种植物多少棵？
<gadget id="calculator">45 * 40 * 4</gadget>
<output>7_200</output>

<result>7_200</result>