Each pen is 8.5 yuan, and each ballpoint pen is 4.5 yuan. How much did Wang Li buy four fountain pens and one ballpoint pen?
每支钢笔8.5元，每支圆珠笔4.5元，王力买四支钢笔和一支圆珠笔，花了多少元？
<gadget id="calculator">8.5 * 4</gadget>
<output>34</output>

<gadget id="calculator">34 + 4.5</gadget>
<output>38.5</output>

<result>38.5</result>