A parallelogram street billboard has a base of 8.5 meters and a height of 5.4 meters. To paint this billboard, 0.5 kilograms of paint is needed per square meter. How many kilograms of paint should be prepared at least?
一块平行四边形街头广告牌，底是8.5米，高是5.4米．要粉刷这块广告牌，每平方米要用油漆0.5千克，至少准备多少千克油漆？
<gadget id="calculator">8.5 * 5.4 * 0.5</gadget>
<output>22.95</output>

<result>22.95</result>