Xiaoming's family buys a box of milk for 3.8 yuan and a bag of soy milk for 2.2 yuan every day. How much does it cost to buy milk and soy milk in one week?
小明家每天要买一盒牛奶3.8元，和一袋豆浆2.2元．一星期买牛奶和豆浆共要花多少钱？
<gadget id="calculator">3.8 + 2.2</gadget>
<output>6</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<result>42</result>