Uncle Wang fertilizes his vegetable garden. It is known that the vegetable garden is a rectangle with a length of 15 meters and a width of 12 meters. If 30 grams of fertilizer is needed per square meter, how much fertilizer is estimated to be needed in total?
王伯给他的菜园施肥，已知菜园是一个长15米，宽12米的长方形，假如每平方米需要施肥30克，预计菜园一共需要多少肥料？
<gadget id="calculator">15 * 12 * 30</gadget>
<output>5_400</output>

<result>5_400</result>