Mr. Liu bought 8 boxes of watercolor pens. It is known that there are 12 watercolor pens in each box, with an average of 0.5 yuan each. How much did Mr. Liu spend on these watercolor pens?
刘老师买了8盒水彩笔，已知每盒水彩笔有12支，平均每支0.5元，刘老师买这些水彩笔一共花了多少钱？
<gadget id="calculator">0.5 * 12</gadget>
<output>6</output>

<gadget id="calculator">6 * 8</gadget>
<output>48</output>

<result>48</result>