A product whose current selling price is lower than the original price (1/4), what is the current selling price of the original price.
一种产品，现在售价比原价降低(1/4)，现在售价是原价的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>