The original price of a certain commodity is 16 yuan, but the current price has risen to 20 yuan. How much has the price increased.
某一件商品原价格16元，现价涨到了20元．价格涨了多少．
<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>