A pair of sneakers is sold at a 25% discount, the current price is 300 yuan, how much is the original price of each pair.
一双球鞋打七五折出售，现价300元，原来每双售价多少元．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">300 / (3/4)</gadget>
<output>400</output>

<result>400</result>