The pens in the stationery store cost 7.50 yuan each. Mr. Li bought 6 pens. How much was the total cost?
文具店里钢笔每支售价7.50元，李老师买了6支钢笔，一共用去多少元？
<gadget id="calculator">7.5 * 6</gadget>
<output>45</output>

<result>45</result>