Guangming Village has 121 color TV sets per 100 households this year, an increase of 66 sets over last year. What percentage is the increase this year over last year?
光明村今年每百户拥有彩电121台，比去年增加66台，今年比去年增长了百分之几？
<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>