Pencils cost a each, and pens cost $8. What is the total cost of buying b pencils and 7 pens?
铅笔每枝a元，钢笔每枝8元，买b枝铅笔和7枝钢笔共要多少元．
<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<result>56</result>