sum of money, such as buying a pen of 10 yuan, can buy exactly 36 pens. Now I buy a pen that is 20% more expensive than before. How many pens can I buy? (Column-to-column solution)
一笔钱，如买10元一枝的钢笔，恰好能买36支，现改买单价比前面贵20%的钢笔，够买几支？(列比列解)
<gadget id="calculator">10 * 36</gadget>
<output>360</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 * (1/5)</gadget>
<output>2</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<gadget id="calculator">360 / 12</gadget>
<output>30</output>

<result>30</result>