Teacher Zhao bought 8 boxes of watercolor pens, 12 pieces of drawing paper and 3 drawing boards. Watercolor pens are 13 yuan per box, drawing paper is 4 yuan each, and drawing boards are 21 yuan each. Please ask two questions and answer them according to the list of questions.
赵老师买了8盒水彩笔、12张绘画纸和3块画板．水彩笔每盒13元，绘画纸每张4元，画板每块21元．请你提出两个问题，根据问题列表整理后解答．
<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>