A parallelogram street billboard has a base of 12.5m and a height of 6.4m. If the billboard is painted on both sides, the amount of paint used per square meter is 0.8kg. How many kilograms of paint is needed?
一块平行四边形的街头广告牌，底是12.5m，高是6.4m，如果把这块广告牌的两面都油漆，每平方米用油漆0.8kg，需要多少千克油漆？
<gadget id="calculator">12.5 * 6.4 * 2 * 0.8</gadget>
<output>128</output>

<result>128</result>