Huangtian Village owns 240 color TV sets this year, an increase of 80 sets over last year. What percentage is the increase this year over last year?
黄天村今年拥有彩电240台，比去年增加80台，今年比去年增长了百分之几？
<gadget id="calculator">240 - 80</gadget>
<output>160</output>

<gadget id="calculator">80 / 160</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>