The original price of a set of sportswear is 400 yuan, how much is the selling price after 25% off.
一套运动服的原价为400元，七五折后的售价为多少元．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

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

<result>300</result>