Ballpoint pens sell for 51 yuan for 5 packages, and 72 yuan for 8 packages. There are 49 children in Teacher Zhang’s class. Teacher Zhang wants to give each child a pen. How much will Teacher Zhang spend at least?
圆珠笔5支包装售51元，8支包装售72元，张老师教的班有49位小朋友，张老师要给每位小朋友1支笔，张老师至少要花多少钱？
<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<gadget id="calculator">8 * 5 * 9</gadget>
<output>360</output>

<gadget id="calculator">51 / 5</gadget>
<output>51/5 = around 10.2</output>

<gadget id="calculator">5 * 2 * (51/5)</gadget>
<output>102</output>

<gadget id="calculator">360 + 102</gadget>
<output>462</output>

<result>462</result>