Sunshine Supermarket sells a radio with an original price of 250 yuan. Due to the added functions, the current price is 300 yuan each. How much has the price increased?
阳光超市卖一种收音机原价250元，由于增加了功能，现价按每部300元销售，涨价了百分之几？
<gadget id="calculator">300 - 250</gadget>
<output>50</output>

<gadget id="calculator">50 / 250</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>