For a commodity, first increase the price by 25%, and then reduce the price by 25%, what is the current price equal to the original price
一种商品，先提价25%，再降价25%，现价相当于原价的多少
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

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

<gadget id="calculator">1 * (5/4) * (3/4)</gadget>
<output>15/16 = around 0.9375</output>

<result>15/16 = around 0.9375</result>