In the school auditorium, there are four pillars with a height of 5 meters and a length and width of 1.5 meters. The pillars are wrapped with colored paper to welcome the Children's Day. Colored paper is 7 yuan per square meter, how much is the total cost?
学校礼堂有四根高5米长和宽都是1.5米的柱子为迎接六一儿童节在柱子上包上彩纸．彩纸每平方米7元，共需多少元？
<gadget id="calculator">1.5 * 5 * 4 * 4 * 7</gadget>
<output>840</output>

<result>840</result>