There are 121 color TV sets in Guangming Village this year, an increase of 66 sets over last year. What percentage is the increase this year over last year? How many columns
光明村今年有彩电121台，比去年增加66台，今年比去年增长了百分之几？列式多少
<gadget id="calculator">121 - 66</gadget>
<output>55</output>

<gadget id="calculator">66 / 55</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>