Xiao Ming's family wants to order fresh milk for three months, July, August, and September. One bottle a day costs 3 yuan. How much milk should Xiao Ming's mother pay the milkman?
小明家要订7、8、9三个月的鲜牛奶，一天一瓶，一瓶3元，小明妈妈应该付给送奶员多少元牛奶钱．
<gadget id="calculator">31 + 31 + 30</gadget>
<output>92</output>

<gadget id="calculator">92 * 3</gadget>
<output>276</output>

<result>276</result>