Due to the country's implementation of the project of sending home appliances to the countryside, Xingfu Village has 120 color TVs per 100 households this year, an increase of 40 from last year. How many color TVs per 100 households had last year? What is the increase this year over last year?
由于国家实施了家电下乡工程，幸福村今年每百户拥有彩电120台，比去年增加40台，去年每百户拥有彩电多少台？今年比去年增加几成？
<gadget id="calculator">120 - 40</gadget>
<output>80</output>

<result>80</result>