A supermarket engages in product promotions on New Year's Day. The current price of a commodity is 10 yuan, which is 80% of the original price. How much is the original price higher than the current price?
某超市元旦搞商品促销活动．一种商品现在售价是10元，是原价的80%，原价比现价高出百分之几？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">10 / (4/5)</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">(25/2) - 10</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) / 10</gadget>
<output>1/4 = around 0.25</output>

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