Teacher Zhang bought 4 boxes of fountain pens, 12 in each box, and 5 yuan for each fountain pen. How much does Mr. Zhang have to pay in total?
张老师买来了4盒水笔，每盒12支，每支水笔5元．张老师共要付多少元钱？
<gadget id="calculator">4 * 12</gadget>
<output>48</output>

<gadget id="calculator">5 * 48</gadget>
<output>240</output>

<result>240</result>